diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 1ba555e05b3..3fc490e6374 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -43,6 +43,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <thread>
 #include <iterator>
 #include <memory>
 #include <optional>
@@ -982,4 +983,31 @@ BOOST_AUTO_TEST_CASE(block_template_manager)
     BOOST_CHECK(block_template->vTxSigOpsCost.empty());
 }
 
+// Reproduction (AR-31): submitSolution rewrites the stored block while
+// getBlock reads it from another thread. Run under ThreadSanitizer.
+BOOST_AUTO_TEST_CASE(repro_submitsolution_concurrent_getblock)
+{
+    auto mining{MakeMining()};
+    BlockCreateOptions options{.coinbase_output_script = CScript() << OP_TRUE};
+    std::unique_ptr<BlockTemplate> block_template{mining->createNewBlock(options, /*cooldown=*/false)};
+    BOOST_REQUIRE(block_template);
+    constexpr int ITERATIONS{200};
+    std::thread reader([&] {
+        for (int i = 0; i < ITERATIONS; ++i) {
+            CBlock block{block_template->getBlock()};
+            BOOST_CHECK(!block.vtx.empty());
+        }
+    });
+    for (int i = 0; i < ITERATIONS; ++i) {
+        CMutableTransaction coinbase;
+        coinbase.vin.resize(1);
+        coinbase.vin[0].scriptSig = CScript() << i << OP_0;
+        coinbase.vout.resize(1);
+        coinbase.vout[0].scriptPubKey = CScript() << OP_TRUE;
+        std::string reason, debug;
+        (void)block_template->submitSolution(/*version=*/1, /*timestamp=*/0, /*nonce=*/i, MakeTransactionRef(std::move(coinbase)), reason, debug);
+    }
+    reader.join();
+}
+
 BOOST_AUTO_TEST_SUITE_END()