diff --git a/doc/release-notes-31175.md b/doc/release-notes-31175.md
new file mode 100644
index 0000000000..84a04a7426
--- /dev/null
+++ b/doc/release-notes-31175.md
@@ -0,0 +1,8 @@
+RPC
+---
+
+Duplicate blocks submitted with `submitblock` will now persist their block data
+even if it was previously pruned. If pruning is activated, the data will be
+pruned again eventually once the block file it is persisted in is selected for
+pruning. This is consistent with the behaviour of `getblockfrompeer` where the
+block is persisted as well even when pruning.
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 47a5bce22b..77fef83a5b 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -1016,17 +1016,6 @@ static RPCHelpMan submitblock()
     }
 
     ChainstateManager& chainman = EnsureAnyChainman(request.context);
-    uint256 hash = block.GetHash();
-    {
-        LOCK(cs_main);
-        const CBlockIndex* pindex = chainman.m_blockman.LookupBlockIndex(hash);
-        if (pindex) {
-            if (pindex->IsValid(BLOCK_VALID_SCRIPTS)) {
-                return "duplicate";
-            }
-        }
-    }
-
     {
         LOCK(cs_main);
         const CBlockIndex* pindex = chainman.m_blockman.LookupBlockIndex(block.hashPrevBlock);