diff --git a/src/common/args.cpp b/src/common/args.cpp
index 1e3f6d1b88d..3679d3d698e 100644
--- a/src/common/args.cpp
+++ b/src/common/args.cpp
@@ -589,6 +589,14 @@ void ArgsManager::AddHiddenArgs(const std::vector<std::string>& names)
     }
 }
 
+void ArgsManager::ClearArgs()
+{
+    LOCK(cs_args);
+    m_settings = {};
+    m_available_args.clear();
+    m_network_only_args.clear();
+}
+
 void ArgsManager::CheckMultipleCLIArgs() const
 {
     LOCK(cs_args);
diff --git a/src/common/args.h b/src/common/args.h
index 8d9daf5f65d..69a04a048a9 100644
--- a/src/common/args.h
+++ b/src/common/args.h
@@ -359,11 +359,7 @@ protected:
     /**
      * Clear available arguments
      */
-    void ClearArgs() {
-        LOCK(cs_args);
-        m_available_args.clear();
-        m_network_only_args.clear();
-    }
+    void ClearArgs();
 
     /**
      * Check CLI command args
diff --git a/src/netbase.h b/src/netbase.h
index 3ac23050115..de9b35bc761 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -121,6 +121,13 @@ public:
         m_reachable.clear();
     }
 
+    void Reset() EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
+    {
+        AssertLockNotHeld(m_mutex);
+        LOCK(m_mutex);
+        m_reachable = DefaultNets();
+    }
+
     [[nodiscard]] bool Contains(Network net) const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
     {
         AssertLockNotHeld(m_mutex);
@@ -142,17 +149,21 @@ public:
     }
 
 private:
-    mutable Mutex m_mutex;
-
-    std::unordered_set<Network> m_reachable GUARDED_BY(m_mutex){
-        NET_UNROUTABLE,
-        NET_IPV4,
-        NET_IPV6,
-        NET_ONION,
-        NET_I2P,
-        NET_CJDNS,
-        NET_INTERNAL
+    static std::unordered_set<Network> DefaultNets()
+    {
+        return {
+            NET_UNROUTABLE,
+            NET_IPV4,
+            NET_IPV6,
+            NET_ONION,
+            NET_I2P,
+            NET_CJDNS,
+            NET_INTERNAL
+        };
     };
+
+    mutable Mutex m_mutex;
+    std::unordered_set<Network> m_reachable GUARDED_BY(m_mutex){DefaultNets()};
 };
 
 extern ReachableNets g_reachable_nets;
diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 34f19df2564..fae7fe3a2d3 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -323,6 +323,12 @@ void SetRPCWarmupStatus(const std::string& newStatus)
     rpcWarmupStatus = newStatus;
 }
 
+void SetRPCWarmupStarting()
+{
+    LOCK(g_rpc_warmup_mutex);
+    fRPCInWarmup = true;
+}
+
 void SetRPCWarmupFinished()
 {
     LOCK(g_rpc_warmup_mutex);
diff --git a/src/rpc/server.h b/src/rpc/server.h
index 5a22279a58e..55ec36d9c7a 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -30,6 +30,7 @@ void RpcInterruptionPoint();
  */
 void SetRPCWarmupStatus(const std::string& newStatus);
 /* Mark warmup as done.  RPC calls will be processed from now on.  */
+void SetRPCWarmupStarting();
 void SetRPCWarmupFinished();
 
 /* returns the current warmup state.  */
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index 48c2eb5c32e..b850c799ca4 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -63,6 +63,7 @@ add_executable(test_bitcoin
   net_peer_eviction_tests.cpp
   net_tests.cpp
   netbase_tests.cpp
+  node_init_tests.cpp
   node_warnings_tests.cpp
   orphanage_tests.cpp
   pcp_tests.cpp
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index 0036d94c2fa..5089e1acc1b 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -702,6 +702,7 @@ BOOST_AUTO_TEST_CASE(get_local_addr_for_peer_port)
 
 BOOST_AUTO_TEST_CASE(LimitedAndReachable_Network)
 {
+    g_reachable_nets.Reset();
     BOOST_CHECK(g_reachable_nets.Contains(NET_IPV4));
     BOOST_CHECK(g_reachable_nets.Contains(NET_IPV6));
     BOOST_CHECK(g_reachable_nets.Contains(NET_ONION));
diff --git a/src/test/node_init_tests.cpp b/src/test/node_init_tests.cpp
new file mode 100644
index 00000000000..ed676e3c05a
--- /dev/null
+++ b/src/test/node_init_tests.cpp
@@ -0,0 +1,49 @@
+// Copyright (c) 2025 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <init.h>
+#include <interfaces/init.h>
+#include <rpc/server.h>
+
+#include <boost/test/unit_test.hpp>
+#include <test/util/setup_common.h>
+
+using node::NodeContext;
+
+BOOST_FIXTURE_TEST_SUITE(node_init_tests, BasicTestingSetup)
+
+//! Custom implementation of interfaces::Init for testing.
+class TestInit : public interfaces::Init
+{
+public:
+    TestInit(NodeContext& node) : m_node(node)
+    {
+        InitContext(m_node);
+        m_node.init = this;
+    }
+    std::unique_ptr<interfaces::Chain> makeChain() override { return interfaces::MakeChain(m_node); }
+    std::unique_ptr<interfaces::WalletLoader> makeWalletLoader(interfaces::Chain& chain) override
+    {
+        return MakeWalletLoader(chain, *Assert(m_node.args));
+    }
+    NodeContext& m_node;
+};
+
+BOOST_AUTO_TEST_CASE(init_test)
+{
+    // Reset logging, config file path, rpc state, reachable nets to avoid errors in AppInitMain
+    LogInstance().DisconnectTestLogger();
+    m_node.args->SetConfigFilePath({});
+    SetRPCWarmupStarting();
+    g_reachable_nets.Reset();
+
+    // Run through initialization and shutdown code.
+    TestInit init{m_node};
+    BOOST_CHECK(AppInitInterfaces(m_node));
+    BOOST_CHECK(AppInitMain(m_node));
+    Interrupt(m_node);
+    Shutdown(m_node);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 82bbc4adcba..ec88cda3e0f 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -214,7 +214,10 @@ BasicTestingSetup::~BasicTestingSetup()
     } else {
         fs::remove_all(m_path_root);
     }
+    // Clear all arguments except for -datadir, which GUI tests currently rely
+    // on to be set even after the testing setup is destroyed.
     gArgs.ClearArgs();
+    gArgs.ForceSetArg("-datadir", fs::PathToString(m_path_root));
 }
 
 ChainTestingSetup::ChainTestingSetup(const ChainType chainType, TestOpts opts)