diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 37d7ae6912..f4d89f6142 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -1155,6 +1155,8 @@ class PersistEventsStore:
         to_delete = delta_state.to_delete
         to_insert = delta_state.to_insert
 
+        logger.info("asdf _update_current_state_txn: %s %s", to_delete, to_insert)
+
         # Figure out the changes of membership to invalidate the
         # `get_rooms_for_user` cache.
         # We find out which membership events we may have deleted
diff --git a/tests/handlers/test_federation.py b/tests/handlers/test_federation.py
index 9847893fce..2e568be69f 100644
--- a/tests/handlers/test_federation.py
+++ b/tests/handlers/test_federation.py
@@ -681,6 +681,17 @@ class PartialJoinTestCase(unittest.FederatingHomeserverTestCase):
             f" failed do_invite_join!",
         )
 
+        # Sanity check that we're not leaving behind any current state events.
+        current_state_check_rows = self.get_success(
+            store.db_pool.simple_select_list(
+                table="current_state_events",
+                keyvalues={"room_id": room_id},
+                retcols=("event_id",),
+                desc="check current_state_events in test",
+            )
+        )
+        self.assertEqual(len(current_state_check_rows), 0)
+
     def test_duplicate_partial_state_room_syncs(self) -> None:
         """
         Tests that concurrent partial state syncs are not started for the same room.