When I subscribe to a community using an account I created in a new instance all federated communities look empties to me.
Is this some kind of limitation of ActivityPub? Is there a fix being thought about? Is there an provisional/temporary solution?
Yes, I would call it a bug. If it’s the first time your instance ‘sees’ that community, only new posts will be federated.
It does not know about older posts, not even older pinned posts that may be important.
https://github.com/LemmyNet/lemmy/issues/2640 - fix appears to be in progress