this was doing nothing (it is a fragment back when there was no deprecated rtcSession.room)

src/room/GroupCallView.tsx

@@ -149,12 +149,10 @@ export const GroupCallView: FC<Props> = ({
   );
   useEffect(() => {
     // Sanity check the room object
-    if (client.getRoom(rtcSession.room.roomId) !== rtcSession.room) {
+    if (client.getRoom(rtcSession.room.roomId) !== rtcSession.room)
       logger.warn(
         `We've ended up with multiple rooms for the same ID (${rtcSession.room.roomId}). This indicates a bug in the group call loading code, and may lead to incomplete room state.`,
       );
-      return undefined;
-    }
   }, [client, rtcSession.room]);
 
   const room = rtcSession.room as Room;