assumevalid: log every script validation state change

diff --git a/src/validation.cpp b/src/validation.cpp
index cf5f5469..27ad61d3 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2580,6 +2580,11 @@ bool Chainstate::ConnectBlock(const CBlock& block, BlockValidationState& state,
              Ticks<SecondsDouble>(m_chainman.time_forks),
              Ticks<MillisecondsDouble>(m_chainman.time_forks) / m_chainman.num_blocks_total);
 
+    if (fScriptChecks != m_prev_script_checks_logged && GetRole() == ChainstateRole::NORMAL) {
+        LogInfo("%s signature validations at block #%d (%s).", fScriptChecks ? "Enabling" : "Disabling", pindex->nHeight, block_hash.ToString());
+        m_prev_script_checks_logged = fScriptChecks;
+    }
+
     CBlockUndo blockundo;
 
     // Precomputed transaction data pointers must not be invalidated
diff --git a/src/validation.h b/src/validation.h
index c25dd2de..870d56d1 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -550,6 +550,8 @@ protected:
     //! Cached result of LookupBlockIndex(*m_from_snapshot_blockhash)
     mutable const CBlockIndex* m_cached_snapshot_base GUARDED_BY(::cs_main){nullptr};
 
+    std::atomic_bool m_prev_script_checks_logged{true};
+
 public:
     //! Reference to a BlockManager instance which itself is shared across all
     //! Chainstate instances.
diff --git a/test/functional/feature_assumevalid.py b/test/functional/feature_assumevalid.py
index 7d097b13..5f7fff82 100755
--- a/test/functional/feature_assumevalid.py
+++ b/test/functional/feature_assumevalid.py
@@ -153,12 +153,12 @@ class AssumeValidTest(BitcoinTestFramework):
         p2p1 = self.nodes[1].add_p2p_connection(BaseNode())
         p2p1.send_header_for_blocks(self.blocks[0:2000])
         p2p1.send_header_for_blocks(self.blocks[2000:])
-
-        # Send all blocks to node1. All blocks will be accepted.
-        for i in range(2202):
-            p2p1.send_without_ping(msg_block(self.blocks[i]))
-        # Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync.
-        p2p1.sync_with_ping(timeout=960)
+        with self.nodes[1].assert_debug_log(expected_msgs=['Disabling signature validations at block #1', 'Enabling signature validations at block #103']):
+            # Send all blocks to node1. All blocks will be accepted.
+            for i in range(2202):
+                p2p1.send_without_ping(msg_block(self.blocks[i]))
+            # Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync.
+            p2p1.sync_with_ping(timeout=960)
         assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 2202)
 
         p2p2 = self.nodes[2].add_p2p_connection(BaseNode())