diff --git a/contrib/signet/miner b/contrib/signet/miner
index e020c4589c1..155e198ae68 100755
--- a/contrib/signet/miner
+++ b/contrib/signet/miner
@@ -19,7 +19,7 @@ PATH_BASE_TEST_FUNCTIONAL = os.path.abspath(os.path.join(PATH_BASE_CONTRIB_SIGNE
 sys.path.insert(0, PATH_BASE_TEST_FUNCTIONAL)
 
 from test_framework.blocktools import get_witness_script, script_BIP34_coinbase_height # noqa: E402
-from test_framework.messages import CBlock, CBlockHeader, COutPoint, CTransaction, CTxIn, CTxInWitness, CTxOut, from_binary, from_hex, ser_string, ser_uint256, tx_from_hex # noqa: E402
+from test_framework.messages import CBlock, CBlockHeader, COutPoint, CTransaction, CTxIn, CTxInWitness, CTxOut, from_binary, from_hex, ser_string, ser_uint256, tx_from_hex, MAX_SEQUENCE_NONFINAL # noqa: E402
 from test_framework.psbt import PSBT, PSBTMap, PSBT_GLOBAL_UNSIGNED_TX, PSBT_IN_FINAL_SCRIPTSIG, PSBT_IN_FINAL_SCRIPTWITNESS, PSBT_IN_NON_WITNESS_UTXO, PSBT_IN_SIGHASH_TYPE # noqa: E402
 from test_framework.script import CScript, CScriptOp # noqa: E402
 
@@ -102,7 +102,8 @@ def generate_psbt(tmpl, reward_spk, *, blocktime=None, poolid=None):
         scriptSig = CScript(b"" + scriptSig + CScriptOp.encode_op_pushdata(poolid))
 
     cbtx = CTransaction()
-    cbtx.vin = [CTxIn(COutPoint(0, 0xffffffff), scriptSig, 0xffffffff)]
+    cbtx.nLockTime = tmpl["height"] - 1
+    cbtx.vin = [CTxIn(COutPoint(0, 0xffffffff), scriptSig, MAX_SEQUENCE_NONFINAL)]
     cbtx.vout = [CTxOut(tmpl["coinbasevalue"], reward_spk)]
     cbtx.vin[0].nSequence = 2**32-2
     cbtx.rehash()
diff --git a/src/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
index 4a747e7317c..ad712ba6c62 100644
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -582,23 +582,23 @@ public:
         m_assumeutxo_data = {
             {   // For use by unit tests
                 .height = 110,
-                .hash_serialized = AssumeutxoHash{uint256{"6657b736d4fe4db0cbc796789e812d5dba7f5c143764b1b6905612f1830609d1"}},
+                .hash_serialized = AssumeutxoHash{uint256{"b952555c8ab81fec46f3d4253b7af256d766ceb39fb7752b9d18cdf4a0141327"}},
                 .m_chain_tx_count = 111,
-                .blockhash = consteval_ctor(uint256{"696e92821f65549c7ee134edceeeeaaa4105647a3c4fd9f298c0aec0ab50425c"}),
+                .blockhash = consteval_ctor(uint256{"6affe030b7965ab538f820a56ef56c8149b7dc1d1c144af57113be080db7c397"}),
             },
             {
                 // For use by fuzz target src/test/fuzz/utxo_snapshot.cpp
                 .height = 200,
-                .hash_serialized = AssumeutxoHash{uint256{"7e3b7780fbd2fa479a01f66950dc8f728dc1b11f03d06d5bf223168520df3a48"}},
+                .hash_serialized = AssumeutxoHash{uint256{"17dcc016d188d16068907cdeb38b75691a118d43053b8cd6a25969419381d13a"}},
                 .m_chain_tx_count = 201,
-                .blockhash = consteval_ctor(uint256{"5e93653318f294fb5aa339d00bbf8cf1c3515488ad99412c37608b139ea63b27"}),
+                .blockhash = consteval_ctor(uint256{"385901ccbd69dff6bbd00065d01fb8a9e464dede7cfe0372443884f9b1dcf6b9"}),
             },
             {
                 // For use by test/functional/feature_assumeutxo.py
                 .height = 299,
-                .hash_serialized = AssumeutxoHash{uint256{"a4bf3407ccb2cc0145c49ebba8fa91199f8a3903daf0883875941497d2493c27"}},
+                .hash_serialized = AssumeutxoHash{uint256{"d2b051ff5e8eef46520350776f4100dd710a63447a8e01d917e92e79751a63e2"}},
                 .m_chain_tx_count = 334,
-                .blockhash = consteval_ctor(uint256{"3bb7ce5eba0be48939b7a521ac1ba9316afee2c7bada3a0cca24188e6d7d96c0"}),
+                .blockhash = consteval_ctor(uint256{"7cc695046fec709f8c9394b6f928f81e81fd3ac20977bb68760fa1faa7916ea2"}),
             },
         };
 
diff --git a/src/node/miner.cpp b/src/node/miner.cpp
index c24debd1e69..408b7ec7e73 100644
--- a/src/node/miner.cpp
+++ b/src/node/miner.cpp
@@ -158,10 +158,13 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock()
     CMutableTransaction coinbaseTx;
     coinbaseTx.vin.resize(1);
     coinbaseTx.vin[0].prevout.SetNull();
+    coinbaseTx.vin[0].nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; // Make sure timelock is enforced.
     coinbaseTx.vout.resize(1);
     coinbaseTx.vout[0].scriptPubKey = m_options.coinbase_output_script;
     coinbaseTx.vout[0].nValue = nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
     coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
+    Assert(nHeight > 0);
+    coinbaseTx.nLockTime = static_cast<uint32_t>(nHeight - 1);
     pblock->vtx[0] = MakeTransactionRef(std::move(coinbaseTx));
     pblocktemplate->vchCoinbaseCommitment = m_chainstate.m_chainman.GenerateCoinbaseCommitment(*pblock, pindexPrev);
 
diff --git a/src/test/blockfilter_index_tests.cpp b/src/test/blockfilter_index_tests.cpp
index 4b576bb084f..81119f52b19 100644
--- a/src/test/blockfilter_index_tests.cpp
+++ b/src/test/blockfilter_index_tests.cpp
@@ -81,6 +81,7 @@ CBlock BuildChainTestingSetup::CreateBlock(const CBlockIndex* prev,
     }
     {
         CMutableTransaction tx_coinbase{*block.vtx.at(0)};
+        tx_coinbase.nLockTime = static_cast<uint32_t>(prev->nHeight);
         tx_coinbase.vin.at(0).scriptSig = CScript{} << prev->nHeight + 1;
         block.vtx.at(0) = MakeTransactionRef(std::move(tx_coinbase));
         block.hashMerkleRoot = BlockMerkleRoot(block);
diff --git a/src/test/fuzz/utxo_total_supply.cpp b/src/test/fuzz/utxo_total_supply.cpp
index e574c5b85c5..9be85df99fa 100644
--- a/src/test/fuzz/utxo_total_supply.cpp
+++ b/src/test/fuzz/utxo_total_supply.cpp
@@ -52,6 +52,7 @@ FUZZ_TARGET(utxo_total_supply)
         // Replace OP_FALSE with OP_TRUE
         {
             CMutableTransaction tx{*block->vtx.back()};
+            tx.nLockTime = 0; // Use the same nLockTime for all as we want to duplicate one of them.
             tx.vout.at(0).scriptPubKey = CScript{} << OP_TRUE;
             block->vtx.back() = MakeTransactionRef(tx);
         }
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 5b87d4443d9..773392b7eaa 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -70,27 +70,27 @@ BOOST_FIXTURE_TEST_SUITE(miner_tests, MinerTestingSetup)
 static CFeeRate blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
 
 constexpr static struct {
-    unsigned char extranonce;
+    unsigned int extranonce;
     unsigned int nonce;
-} BLOCKINFO[]{{8, 582909131},  {0, 971462344},  {2, 1169481553}, {6, 66147495},  {7, 427785981},  {8, 80538907},
-              {8, 207348013},  {2, 1951240923}, {4, 215054351},  {1, 491520534}, {8, 1282281282}, {4, 639565734},
-              {3, 248274685},  {8, 1160085976}, {6, 396349768},  {5, 393780549}, {5, 1096899528}, {4, 965381630},
-              {0, 728758712},  {5, 318638310},  {3, 164591898},  {2, 274234550}, {2, 254411237},  {7, 561761812},
-              {2, 268342573},  {0, 402816691},  {1, 221006382},  {6, 538872455}, {7, 393315655},  {4, 814555937},
-              {7, 504879194},  {6, 467769648},  {3, 925972193},  {2, 200581872}, {3, 168915404},  {8, 430446262},
-              {5, 773507406},  {3, 1195366164}, {0, 433361157},  {3, 297051771}, {0, 558856551},  {2, 501614039},
-              {3, 528488272},  {2, 473587734},  {8, 230125274},  {2, 494084400}, {4, 357314010},  {8, 60361686},
-              {7, 640624687},  {3, 480441695},  {8, 1424447925}, {4, 752745419}, {1, 288532283},  {6, 669170574},
-              {5, 1900907591}, {3, 555326037},  {3, 1121014051}, {0, 545835650}, {8, 189196651},  {5, 252371575},
-              {0, 199163095},  {6, 558895874},  {6, 1656839784}, {6, 815175452}, {6, 718677851},  {5, 544000334},
-              {0, 340113484},  {6, 850744437},  {4, 496721063},  {8, 524715182}, {6, 574361898},  {6, 1642305743},
-              {6, 355110149},  {5, 1647379658}, {8, 1103005356}, {7, 556460625}, {3, 1139533992}, {5, 304736030},
-              {2, 361539446},  {2, 143720360},  {6, 201939025},  {7, 423141476}, {4, 574633709},  {3, 1412254823},
-              {4, 873254135},  {0, 341817335},  {6, 53501687},   {3, 179755410}, {5, 172209688},  {8, 516810279},
-              {4, 1228391489}, {8, 325372589},  {6, 550367589},  {0, 876291812}, {7, 412454120},  {7, 717202854},
-              {2, 222677843},  {6, 251778867},  {7, 842004420},  {7, 194762829}, {4, 96668841},   {1, 925485796},
-              {0, 792342903},  {6, 678455063},  {6, 773251385},  {5, 186617471}, {6, 883189502},  {7, 396077336},
-              {8, 254702874},  {0, 455592851}};
+} BLOCKINFO[]{{0, 3552706918},   {500, 37506755},   {1000, 948987788}, {400, 524762339},  {800, 258510074},  {300, 102309278},
+              {1300, 54365202},  {600, 1107740426}, {1000, 203094491}, {900, 391178848},  {800, 381177271},  {600, 87188412},
+              {0, 66522866},     {800, 874942736},  {1000, 89200838},  {400, 312638088},  {400, 66263693},   {500, 924648304},
+              {400, 369913599},  {500, 47630099},   {500, 115045364},  {100, 277026602},  {1100, 809621409}, {700, 155345322},
+              {800, 943579953},  {400, 28200730},   {900, 77200495},   {0, 105935488},    {400, 698721821},  {500, 111098863},
+              {1300, 445389594}, {500, 621849894},  {1400, 56010046},  {1100, 370669776}, {1200, 380301940}, {1200, 110654905},
+              {400, 213771024},  {1500, 120014726}, {1200, 835019014}, {1500, 624817237}, {900, 1404297},    {400, 189414558},
+              {400, 293178348},  {1100, 15393789},  {600, 396764180},  {800, 1387046371}, {800, 199368303},  {700, 111496662},
+              {100, 129759616},  {200, 536577982},  {500, 125881300},  {500, 101053391},  {1200, 471590548}, {900, 86957729},
+              {1200, 179604104}, {600, 68658642},   {1000, 203295701}, {500, 139615361},  {900, 233693412},  {300, 153225163},
+              {0, 27616254},     {1200, 9856191},   {100, 220392722},  {200, 66257599},   {1100, 145489641}, {1300, 37859442},
+              {400, 5816075},    {1200, 215752117}, {1400, 32361482},  {1400, 6529223},   {500, 143332977},  {800, 878392},
+              {700, 159290408},  {400, 123197595},  {700, 43988693},   {300, 304224916},  {700, 214771621},  {1100, 274148273},
+              {400, 285632418},  {1100, 923451065}, {600, 12818092},   {1200, 736282054}, {1000, 246683167}, {600, 92950402},
+              {1400, 29223405},  {1000, 841327192}, {700, 174301283},  {1400, 214009854}, {1000, 6989517},   {1200, 278226956},
+              {700, 540219613},  {400, 93663104},   {1100, 152345635}, {1500, 464194499}, {1300, 333850111}, {600, 258311263},
+              {600, 90173162},   {1000, 33590797},  {1500, 332866027}, {100, 204704427},  {1000, 463153545}, {800, 303244785},
+              {600, 88096214},   {0, 137477892},    {1200, 195514506}, {300, 704114595},  {900, 292087369},  {1400, 758684870},
+              {1300, 163493028}, {1200, 53151293}};
 
 static std::unique_ptr<CBlockIndex> CreateBlockIndex(int nHeight, CBlockIndex* active_chain_tip) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
 {
diff --git a/src/test/rbf_tests.cpp b/src/test/rbf_tests.cpp
index c6d06c937c5..671dab56f71 100644
--- a/src/test/rbf_tests.cpp
+++ b/src/test/rbf_tests.cpp
@@ -311,7 +311,7 @@ BOOST_FIXTURE_TEST_CASE(rbf_helper_functions, TestChain100Setup)
     // Tests for CheckConflictTopology
 
     // Tx4 has 23 descendants
-    BOOST_CHECK_EQUAL(pool.CheckConflictTopology(set_34_cpfp).value(), strprintf("%s has 23 descendants, max 1 allowed", entry4_high->GetSharedTx()->GetHash().ToString()));
+    BOOST_CHECK_EQUAL(pool.CheckConflictTopology(set_34_cpfp).value(), strprintf("%s has 24 descendants, max 1 allowed", entry3_low->GetSharedTx()->GetHash().ToString()));
 
     // No descendants yet
     BOOST_CHECK(pool.CheckConflictTopology({entry9_unchained}) == std::nullopt);
@@ -441,7 +441,7 @@ BOOST_FIXTURE_TEST_CASE(improves_feerate, TestChain100Setup)
     const auto res3 = ImprovesFeerateDiagram(*changeset);
     BOOST_CHECK(res3.has_value());
     BOOST_CHECK(res3.value().first == DiagramCheckError::UNCALCULABLE);
-    BOOST_CHECK(res3.value().second == strprintf("%s has 2 ancestors, max 1 allowed", tx5->GetHash().GetHex()));
+    BOOST_CHECK_MESSAGE(res3.value().second == strprintf("%s has 2 descendants, max 1 allowed", tx1->GetHash().GetHex()), res3.value().second);
 }
 
 BOOST_FIXTURE_TEST_CASE(calc_feerate_diagram_rbf, TestChain100Setup)
@@ -536,7 +536,7 @@ BOOST_FIXTURE_TEST_CASE(calc_feerate_diagram_rbf, TestChain100Setup)
         changeset->StageAddition(replacement_tx, high_fee, 0, 1, 0, false, 4, LockPoints());
         const auto replace_too_large{changeset->CalculateChunksForRBF()};
         BOOST_CHECK(!replace_too_large.has_value());
-        BOOST_CHECK_EQUAL(util::ErrorString(replace_too_large).original, strprintf("%s has 2 ancestors, max 1 allowed", normal_tx->GetHash().GetHex()));
+        BOOST_CHECK_EQUAL(util::ErrorString(replace_too_large).original, strprintf("%s has both ancestor and descendant, exceeding cluster limit of 2", high_tx->GetHash().GetHex()));
     }
 
     // Make a size 2 cluster that is itself two chunks; evict both txns
@@ -623,7 +623,7 @@ BOOST_FIXTURE_TEST_CASE(calc_feerate_diagram_rbf, TestChain100Setup)
         const auto replace_cluster_size_3{changeset->CalculateChunksForRBF()};
 
         BOOST_CHECK(!replace_cluster_size_3.has_value());
-        BOOST_CHECK_EQUAL(util::ErrorString(replace_cluster_size_3).original, strprintf("%s has both ancestor and descendant, exceeding cluster limit of 2", conflict_1_child->GetHash().GetHex()));
+        BOOST_CHECK_EQUAL(util::ErrorString(replace_cluster_size_3).original, strprintf("%s has 2 descendants, max 1 allowed", conflict_1->GetHash().GetHex()));
     }
 }
 
diff --git a/src/test/util/mining.cpp b/src/test/util/mining.cpp
index 8baac7bba3e..1cd8f8ee718 100644
--- a/src/test/util/mining.cpp
+++ b/src/test/util/mining.cpp
@@ -17,6 +17,8 @@
 #include <validationinterface.h>
 #include <versionbits.h>
 
+#include <algorithm>
+
 using node::BlockAssembler;
 using node::NodeContext;
 
@@ -34,12 +36,15 @@ std::vector<std::shared_ptr<CBlock>> CreateBlockChain(size_t total_height, const
 {
     std::vector<std::shared_ptr<CBlock>> ret{total_height};
     auto time{params.GenesisBlock().nTime};
+    // NOTE: here `height` does not correspond to the block height but the block height - 1.
     for (size_t height{0}; height < total_height; ++height) {
         CBlock& block{*(ret.at(height) = std::make_shared<CBlock>())};
 
         CMutableTransaction coinbase_tx;
+        coinbase_tx.nLockTime = static_cast<uint32_t>(height);
         coinbase_tx.vin.resize(1);
         coinbase_tx.vin[0].prevout.SetNull();
+        coinbase_tx.vin[0].nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; // Make sure timelock is enforced.
         coinbase_tx.vout.resize(1);
         coinbase_tx.vout[0].scriptPubKey = P2WSH_OP_TRUE;
         coinbase_tx.vout[0].nValue = GetBlockSubsidy(height + 1, params.GetConsensus());
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 82bbc4adcba..76a42d19ea2 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -370,7 +370,7 @@ TestChain100Setup::TestChain100Setup(
         LOCK(::cs_main);
         assert(
             m_node.chainman->ActiveChain().Tip()->GetBlockHash().ToString() ==
-            "571d80a9967ae599cec0448b0b0ba1cfb606f584d8069bd7166b86854ba7a191");
+            "0c8c5f79505775a0f6aed6aca2350718ceb9c6f2c878667864d5c7a6d8ffa2a6");
     }
 }
 
diff --git a/src/test/validation_block_tests.cpp b/src/test/validation_block_tests.cpp
index 5c1f195868b..a0b23f5d3b7 100644
--- a/src/test/validation_block_tests.cpp
+++ b/src/test/validation_block_tests.cpp
@@ -82,7 +82,9 @@ std::shared_ptr<CBlock> MinerTestingSetup::Block(const uint256& prev_hash)
     txCoinbase.vout[0].nValue = 0;
     txCoinbase.vin[0].scriptWitness.SetNull();
     // Always pad with OP_0 at the end to avoid bad-cb-length error
-    txCoinbase.vin[0].scriptSig = CScript{} << WITH_LOCK(::cs_main, return m_node.chainman->m_blockman.LookupBlockIndex(prev_hash)->nHeight + 1) << OP_0;
+    const int prev_height{WITH_LOCK(::cs_main, return m_node.chainman->m_blockman.LookupBlockIndex(prev_hash)->nHeight)};
+    txCoinbase.vin[0].scriptSig = CScript{} << prev_height + 1 << OP_0;
+    txCoinbase.nLockTime = static_cast<uint32_t>(prev_height);
     pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
 
     return pblock;
diff --git a/src/test/validation_tests.cpp b/src/test/validation_tests.cpp
index 2e378ed30b5..7e86b3a35c1 100644
--- a/src/test/validation_tests.cpp
+++ b/src/test/validation_tests.cpp
@@ -142,11 +142,11 @@ BOOST_AUTO_TEST_CASE(test_assumeutxo)
     }
 
     const auto out110 = *params->AssumeutxoForHeight(110);
-    BOOST_CHECK_EQUAL(out110.hash_serialized.ToString(), "6657b736d4fe4db0cbc796789e812d5dba7f5c143764b1b6905612f1830609d1");
+    BOOST_CHECK_EQUAL(out110.hash_serialized.ToString(), "b952555c8ab81fec46f3d4253b7af256d766ceb39fb7752b9d18cdf4a0141327");
     BOOST_CHECK_EQUAL(out110.m_chain_tx_count, 111U);
 
-    const auto out110_2 = *params->AssumeutxoForBlockhash(uint256{"696e92821f65549c7ee134edceeeeaaa4105647a3c4fd9f298c0aec0ab50425c"});
-    BOOST_CHECK_EQUAL(out110_2.hash_serialized.ToString(), "6657b736d4fe4db0cbc796789e812d5dba7f5c143764b1b6905612f1830609d1");
+    const auto out110_2 = *params->AssumeutxoForBlockhash(uint256{"6affe030b7965ab538f820a56ef56c8149b7dc1d1c144af57113be080db7c397"});
+    BOOST_CHECK_EQUAL(out110_2.hash_serialized.ToString(), "b952555c8ab81fec46f3d4253b7af256d766ceb39fb7752b9d18cdf4a0141327");
     BOOST_CHECK_EQUAL(out110_2.m_chain_tx_count, 111U);
 }
 
diff --git a/test/functional/feature_assumeutxo.py b/test/functional/feature_assumeutxo.py
index 2680fc4e410..094e8549c31 100755
--- a/test/functional/feature_assumeutxo.py
+++ b/test/functional/feature_assumeutxo.py
@@ -140,12 +140,12 @@ class AssumeutxoTest(BitcoinTestFramework):
         self.log.info("  - snapshot file with alternated but parsable UTXO data results in different hash")
         cases = [
             # (content, offset, wrong_hash, custom_message)
-            [b"\xff" * 32, 0, "7d52155c9a9fdc4525b637ef6170568e5dad6fabd0b1fdbb9432010b8453095b", None],  # wrong outpoint hash
-            [(2).to_bytes(1, "little"), 32, None, "Bad snapshot data after deserializing 1 coins."],  # wrong txid coins count
+            [b"\xff" * 32, 0, "77874d48d932a5cb7a7f770696f5224ff05746fdcf732a58270b45da0f665934", None],  # wrong outpoint hash
+            [(2).to_bytes(1, "little"), 32, None, "Bad snapshot format or truncated snapshot after deserializing 1 coins."],  # wrong txid coins count
             [b"\xfd\xff\xff", 32, None, "Mismatch in coins count in snapshot metadata and actual snapshot data"],  # txid coins count exceeds coins left
-            [b"\x01", 33, "9f4d897031ab8547665b4153317ae2fdbf0130c7840b66427ebc48b881cb80ad", None],  # wrong outpoint index
-            [b"\x81", 34, "3da966ba9826fb6d2604260e01607b55ba44e1a5de298606b08704bc62570ea8", None],  # wrong coin code VARINT
-            [b"\x80", 34, "091e893b3ccb4334378709578025356c8bcb0a623f37c7c4e493133c988648e5", None],  # another wrong coin code
+            [b"\x01", 33, "9f562925721e4f97e6fde5b590dbfede51e2204a68639525062ad064545dd0ea", None],  # wrong outpoint index
+            [b"\x82", 34, "161393f07f8ad71760b3910a914f677f2cb166e5bcf5354e50d46b78c0422d15", None],  # wrong coin code VARINT
+            [b"\x80", 34, "e6fae191ef851554467b68acff01ca09ad0a2e48c9b3dfea46cf7d35a7fd0ad0", None],  # another wrong coin code
             [b"\x84\x58", 34, None, "Bad snapshot data after deserializing 0 coins"],  # wrong coin case with height 364 and coinbase 0
             [
                 # compressed txout value + scriptpubkey
@@ -164,12 +164,12 @@ class AssumeutxoTest(BitcoinTestFramework):
                 f.write(content)
                 f.write(valid_snapshot_contents[(5 + 2 + 4 + 32 + 8 + offset + len(content)):])
 
-            msg = custom_message if custom_message is not None else f"Bad snapshot content hash: expected a4bf3407ccb2cc0145c49ebba8fa91199f8a3903daf0883875941497d2493c27, got {wrong_hash}."
+            msg = custom_message if custom_message is not None else f"Bad snapshot content hash: expected d2b051ff5e8eef46520350776f4100dd710a63447a8e01d917e92e79751a63e2, got {wrong_hash}."
             expected_error(msg)
 
     def test_headers_not_synced(self, valid_snapshot_path):
         for node in self.nodes[1:]:
-            msg = "Unable to load UTXO snapshot: The base block header (3bb7ce5eba0be48939b7a521ac1ba9316afee2c7bada3a0cca24188e6d7d96c0) must appear in the headers chain. Make sure all headers are syncing, and call loadtxoutset again."
+            msg = "Unable to load UTXO snapshot: The base block header (7cc695046fec709f8c9394b6f928f81e81fd3ac20977bb68760fa1faa7916ea2) must appear in the headers chain. Make sure all headers are syncing, and call loadtxoutset again."
             assert_raises_rpc_error(-32603, msg, node.loadtxoutset, valid_snapshot_path)
 
     def test_invalid_chainstate_scenarios(self):
@@ -228,7 +228,7 @@ class AssumeutxoTest(BitcoinTestFramework):
             block_hash = node.getblockhash(height)
             node.invalidateblock(block_hash)
             assert_equal(node.getblockcount(), height - 1)
-            msg = "Unable to load UTXO snapshot: The base block header (3bb7ce5eba0be48939b7a521ac1ba9316afee2c7bada3a0cca24188e6d7d96c0) is part of an invalid chain."
+            msg = "Unable to load UTXO snapshot: The base block header (7cc695046fec709f8c9394b6f928f81e81fd3ac20977bb68760fa1faa7916ea2) is part of an invalid chain."
             assert_raises_rpc_error(-32603, msg, node.loadtxoutset, dump_output_path)
             node.reconsiderblock(block_hash)
 
@@ -446,7 +446,7 @@ class AssumeutxoTest(BitcoinTestFramework):
         def check_dump_output(output):
             assert_equal(
                 output['txoutset_hash'],
-                "a4bf3407ccb2cc0145c49ebba8fa91199f8a3903daf0883875941497d2493c27")
+                "d2b051ff5e8eef46520350776f4100dd710a63447a8e01d917e92e79751a63e2")
             assert_equal(output["nchaintx"], blocks[SNAPSHOT_BASE_HEIGHT].chain_tx)
 
         check_dump_output(dump_output)
@@ -476,7 +476,7 @@ class AssumeutxoTest(BitcoinTestFramework):
         dump_output4 = n0.dumptxoutset(path='utxos4.dat', rollback=prev_snap_height)
         assert_equal(
             dump_output4['txoutset_hash'],
-            "8a1db0d6e958ce0d7c963bc6fc91ead596c027129bacec68acc40351037b09d7")
+            "45ac2777b6ca96588210e2a4f14b602b41ec37b8b9370673048cc0af434a1ec8")
         assert_not_equal(sha256sum_file(dump_output['path']), sha256sum_file(dump_output4['path']))
 
         # Use a hash instead of a height
diff --git a/test/functional/feature_block.py b/test/functional/feature_block.py
index 2dfa568c5b6..f4f15d293ec 100755
--- a/test/functional/feature_block.py
+++ b/test/functional/feature_block.py
@@ -831,6 +831,7 @@ class FullBlockTest(BitcoinTestFramework):
         self.log.info("Reject a block with a transaction with a duplicate hash of a previous transaction (BIP30)")
         self.move_tip(60)
         b61 = self.next_block(61)
+        b61.vtx[0].nLockTime = 0
         b61.vtx[0].vin[0].scriptSig = DUPLICATE_COINBASE_SCRIPT_SIG
         b61.vtx[0].rehash()
         b61 = self.update_block(61, [])
@@ -853,6 +854,7 @@ class FullBlockTest(BitcoinTestFramework):
         b_spend_dup_cb = self.update_block('spend_dup_cb', [tx])
 
         b_dup_2 = self.next_block('dup_2')
+        b_dup_2.vtx[0].nLockTime = 0
         b_dup_2.vtx[0].vin[0].scriptSig = DUPLICATE_COINBASE_SCRIPT_SIG
         b_dup_2.vtx[0].rehash()
         b_dup_2 = self.update_block('dup_2', [])
diff --git a/test/functional/feature_utxo_set_hash.py b/test/functional/feature_utxo_set_hash.py
index 3ab779b87dc..21a3c13f7e4 100755
--- a/test/functional/feature_utxo_set_hash.py
+++ b/test/functional/feature_utxo_set_hash.py
@@ -67,8 +67,8 @@ class UTXOSetHashTest(BitcoinTestFramework):
         assert_equal(finalized[::-1].hex(), node_muhash)
 
         self.log.info("Test deterministic UTXO set hash results")
-        assert_equal(node.gettxoutsetinfo()['hash_serialized_3'], "d1c7fec1c0623f6793839878cbe2a531eb968b50b27edd6e2a57077a5aed6094")
-        assert_equal(node.gettxoutsetinfo("muhash")['muhash'], "d1725b2fe3ef43e55aa4907480aea98d406fc9e0bf8f60169e2305f1fbf5961b")
+        assert_equal(node.gettxoutsetinfo()['hash_serialized_3'], "e0b4c80f2880985fdf1adc331ed0735ac207588f986c91c7c05e8cf5fe6780f0")
+        assert_equal(node.gettxoutsetinfo("muhash")['muhash'], "8739b878f23030ef39a5547edc7b57f88d50fdaaf47314ff0524608deb13067e")
 
     def run_test(self):
         self.test_muhash_implementation()
diff --git a/test/functional/mempool_package_rbf.py b/test/functional/mempool_package_rbf.py
index 4dc6f8fe364..b638c5f512a 100755
--- a/test/functional/mempool_package_rbf.py
+++ b/test/functional/mempool_package_rbf.py
@@ -384,7 +384,7 @@ class PackageRBFTest(BitcoinTestFramework):
         # Now make conflicting packages for each coin
         package_hex1, _package_txns1 = self.create_simple_package(coin1, DEFAULT_FEE, DEFAULT_CHILD_FEE)
         package_result = node.submitpackage(package_hex1)
-        assert_equal(f"package RBF failed: {child_result['tx'].rehash()} has 2 ancestors, max 1 allowed", package_result["package_msg"])
+        assert_equal(f"package RBF failed: {parent1_result['tx'].rehash()} is not the only parent of child {child_result['tx'].rehash()}", package_result["package_msg"])
 
         package_hex2, _package_txns2 = self.create_simple_package(coin2, DEFAULT_FEE, DEFAULT_CHILD_FEE)
         package_result = node.submitpackage(package_hex2)
@@ -438,7 +438,7 @@ class PackageRBFTest(BitcoinTestFramework):
         # Now make conflicting packages for each coin
         package_hex1, _package_txns1 = self.create_simple_package(coin1, DEFAULT_FEE, DEFAULT_CHILD_FEE)
         package_result = node.submitpackage(package_hex1)
-        assert_equal(f"package RBF failed: {child2_result['tx'].rehash()} is not the only child of parent {parent_result['tx'].rehash()}", package_result["package_msg"])
+        assert_equal(f"package RBF failed: {child1_result['tx'].rehash()} is not the only child of parent {parent_result['tx'].rehash()}", package_result["package_msg"])
 
         package_hex2, _package_txns2 = self.create_simple_package(coin2, DEFAULT_FEE, DEFAULT_CHILD_FEE)
         package_result = node.submitpackage(package_hex2)
diff --git a/test/functional/mining_basic.py b/test/functional/mining_basic.py
index 63fb7002c17..9a77ad7a719 100755
--- a/test/functional/mining_basic.py
+++ b/test/functional/mining_basic.py
@@ -28,9 +28,10 @@ from test_framework.messages import (
     COIN,
     DEFAULT_BLOCK_RESERVED_WEIGHT,
     MAX_BLOCK_WEIGHT,
+    MAX_SEQUENCE_NONFINAL,
     MINIMUM_BLOCK_RESERVED_WEIGHT,
     ser_uint256,
-    WITNESS_SCALE_FACTOR
+    WITNESS_SCALE_FACTOR,
 )
 from test_framework.p2p import P2PDataStore
 from test_framework.test_framework import BitcoinTestFramework
@@ -362,6 +363,12 @@ class MiningTest(BitcoinTestFramework):
             expected_msg=f"Error: Specified -blockmaxweight ({MAX_BLOCK_WEIGHT + 1}) exceeds consensus maximum block weight ({MAX_BLOCK_WEIGHT})",
         )
 
+    def test_height_in_locktime(self):
+        self.log.info("Sanity check generated blocks have their coinbase timelocked to their height.")
+        self.generate(self.nodes[0], 1, sync_fun=self.no_op)
+        block = self.nodes[0].getblock(self.nodes[0].getbestblockhash(), 2)
+        assert_equal(block["tx"][0]["locktime"], block["height"] - 1)
+        assert_equal(block["tx"][0]["vin"][0]["sequence"], MAX_SEQUENCE_NONFINAL)
 
     def run_test(self):
         node = self.nodes[0]
@@ -592,6 +599,7 @@ class MiningTest(BitcoinTestFramework):
         self.test_block_max_weight()
         self.test_timewarp()
         self.test_pruning()
+        self.test_height_in_locktime()
 
 
 if __name__ == '__main__':
diff --git a/test/functional/mining_mainnet.py b/test/functional/mining_mainnet.py
index 1a537cd416d..4f95696f78c 100755
--- a/test/functional/mining_mainnet.py
+++ b/test/functional/mining_mainnet.py
@@ -30,6 +30,7 @@ from test_framework.blocktools import (
 
 from test_framework.messages import (
     CBlock,
+    SEQUENCE_FINAL,
 )
 
 import json
@@ -61,6 +62,10 @@ class MiningMainnetTest(BitcoinTestFramework):
         block.nBits = DIFF_1_N_BITS
         block.nNonce = blocks['nonces'][height - 1]
         block.vtx = [create_coinbase(height=height, script_pubkey=bytes.fromhex(COINBASE_SCRIPT_PUBKEY), retarget_period=2016)]
+        # The alternate mainnet chain was mined with non-timelocked coinbase txs.
+        block.vtx[0].nLockTime = 0
+        block.vtx[0].vin[0].nSequence = SEQUENCE_FINAL
+        block.vtx[0].rehash()
         block.hashMerkleRoot = block.calc_merkle_root()
         block.rehash()
         block_hex = block.serialize(with_witness=False).hex()
diff --git a/test/functional/rpc_dumptxoutset.py b/test/functional/rpc_dumptxoutset.py
index 292744116b2..ba1cca49996 100755
--- a/test/functional/rpc_dumptxoutset.py
+++ b/test/functional/rpc_dumptxoutset.py
@@ -49,15 +49,15 @@ class DumptxoutsetTest(BitcoinTestFramework):
         # Blockhash should be deterministic based on mocked time.
         assert_equal(
             out['base_hash'],
-            '09abf0e7b510f61ca6cf33bab104e9ee99b3528b371d27a2d4b39abb800fba7e')
+            '6885775faa46290bedfa071f22d0598c93f1d7e01f24607c4dedd69b9baa4a8f')
 
         # UTXO snapshot hash should be deterministic based on mocked time.
         assert_equal(
             sha256sum_file(str(expected_path)).hex(),
-            '31fcdd0cf542a4b1dfc13c3c05106620ce48951ef62907dd8e5e8c15a0aa993b')
+            'd9506d541437f5e2892d6b6ea173f55233de11601650c157a27d8f2b9d08cb6f')
 
         assert_equal(
-            out['txoutset_hash'], 'a0b7baa3bf5ccbd3279728f230d7ca0c44a76e9923fca8f32dbfd08d65ea496a')
+            out['txoutset_hash'], 'd4453995f4f20db7bb3a604afd10d7128e8ee11159cde56d5b2fd7f55be7c74c')
         assert_equal(out['nchaintx'], 101)
 
         # Specifying a path to an existing or invalid file will fail.
diff --git a/test/functional/rpc_getblockfrompeer.py b/test/functional/rpc_getblockfrompeer.py
index 62b3d664e0f..05fe7699e0a 100755
--- a/test/functional/rpc_getblockfrompeer.py
+++ b/test/functional/rpc_getblockfrompeer.py
@@ -143,7 +143,7 @@ class GetBlockFromPeerTest(BitcoinTestFramework):
         self.sync_blocks([self.nodes[0], pruned_node])
         pruneheight += 251
         assert_equal(pruned_node.pruneblockchain(700), pruneheight)
-        assert_equal(pruned_node.getblock(pruned_block)["hash"], "36c56c5b5ebbaf90d76b0d1a074dcb32d42abab75b7ec6fa0ffd9b4fbce8f0f7")
+        assert_equal(pruned_node.getblock(pruned_block)["hash"], "196ee3a1a6db2353965081c48ef8e6b031cb2115d084bec6fec937e91a2c6277")
 
         self.log.info("Fetched block can be pruned again when prune height exceeds the height of the tip at the time when the block was fetched")
         self.generate(self.nodes[0], 250, sync_fun=self.no_op)
diff --git a/test/functional/test_framework/blocktools.py b/test/functional/test_framework/blocktools.py
index 8e616285572..c36fdb5c76e 100644
--- a/test/functional/test_framework/blocktools.py
+++ b/test/functional/test_framework/blocktools.py
@@ -29,6 +29,7 @@ from .messages import (
     tx_from_hex,
     uint256_from_compact,
     WITNESS_SCALE_FACTOR,
+    MAX_SEQUENCE_NONFINAL,
 )
 from .script import (
     CScript,
@@ -151,7 +152,8 @@ def create_coinbase(height, pubkey=None, *, script_pubkey=None, extra_output_scr
     If extra_output_script is given, make a 0-value output to that
     script. This is useful to pad block weight/sigops as needed. """
     coinbase = CTransaction()
-    coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff), script_BIP34_coinbase_height(height), SEQUENCE_FINAL))
+    coinbase.nLockTime = height - 1
+    coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff), script_BIP34_coinbase_height(height), MAX_SEQUENCE_NONFINAL))
     coinbaseoutput = CTxOut()
     coinbaseoutput.nValue = nValue * COIN
     if nValue == 50:
diff --git a/test/functional/wallet_assumeutxo.py b/test/functional/wallet_assumeutxo.py
index 2d437e1c93f..22b3c51f183 100755
--- a/test/functional/wallet_assumeutxo.py
+++ b/test/functional/wallet_assumeutxo.py
@@ -118,7 +118,7 @@ class AssumeutxoTest(BitcoinTestFramework):
 
         assert_equal(
             dump_output['txoutset_hash'],
-            "a4bf3407ccb2cc0145c49ebba8fa91199f8a3903daf0883875941497d2493c27")
+            "d2b051ff5e8eef46520350776f4100dd710a63447a8e01d917e92e79751a63e2")
         assert_equal(dump_output["nchaintx"], 334)
         assert_equal(n0.getblockchaininfo()["blocks"], SNAPSHOT_BASE_HEIGHT)