#7785 added ^/_matrix/client/unstable/uk.half-shot.msc2666/user/shared_rooms/.*$.

We check the update_user_directory config flag when handling this API, to basically sanity check that the tables we're about to query are roughly up-to-date (users_who_share_private_rooms, users_in_public_rooms). However, if the request is handled on a different synapse worker which does not have that config flag set, then the request is wrongly refused.

I'm not sure if there is an easy way to check if another Synapse process is configured to update the user directory, or whether we should just remove the check. Another option would just be to ensure this endpoint is handled on the same worker.