no need to join room if creator

synapse/handlers/register.py

@@ -246,6 +246,7 @@ class RegistrationHandler(BaseHandler):
                         },
                         ratelimit=False,
                     )
+                else:
                     yield self._join_user_to_room(fake_requester, r)
             except Exception as e:
                 logger.error("Failed to join new user to %r: %r", r, e)