- the room summary API is indeed enabled on matrix.org and working fine for most rooms
- it is not however capable of giving us data about non-joined + private rooms
- the SDK addresses that by first trying to use known rooms before resorting to the preview endpoint
- that fails if it's a brand new room that the client doesn't know about yet i.e. a sync hasn't ran, which is exactly what's happening here
- the ClientProxy instead does wait for the room list to go into the first loaded before returning the room
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