Handle the case of remote users leaving a partial join room for device lists (#13885)

synapse/storage/databases/main/events.py

@@ -1202,6 +1202,12 @@ class PersistEventsStore:
                 txn, room_id, members_changed
             )
 
+            # Check if any of the remote membership changes requires us to
+            # unsubscribe from their device lists.
+            self.store.handle_potentially_left_users_txn(
+                txn, {m for m in members_changed if not self.hs.is_mine_id(m)}
+            )
+
     def _upsert_room_version_txn(self, txn: LoggingTransaction, room_id: str) -> None:
         """Update the room version in the database based off current state
         events.