Fix bug where the state deltas were incorrect

synapse/state/__init__.py

@@ -769,6 +769,11 @@ def _make_state_cache_entry(
     delta_ids: Optional[StateMap[str]] = None
 
     for old_group, old_state in state_groups_ids.items():
+        if old_state.keys() - new_state.keys():
+            # Currently we don't support deltas that remove keys from the state
+            # map.
+            continue
+
         n_delta_ids = {k: v for k, v in new_state.items() if old_state.get(k) != v}
         if not delta_ids or len(n_delta_ids) < len(delta_ids):
             prev_group = old_group