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6b0987385e
When instantiating a room preview, previously it would try to just check if the room exists locally either as joined, invited, knocked, left, etc., and then retrieve the info we cached about it. While this seems fine for most cases, it turns out for non-joined rooms, the info we have locally will **always** be the one we received when the invite/knock/leave action took place and it'll never be updated, so we may have the case where we knock into a room, never receive a response, someone changes the join rule of the room to something else and we'll think about this room as a 'request to join' room until we clear the local cache. To prevent that, we can only use the local data for joined rooms, which are constantly updated, and try to use the room summary API and other fallbacks for the rest, even if they're rooms known to us.