If you don’t know Beehaw.org defederated from us but communities from there that have a copy on this instance are still visible to Us and we can post on them, they can’t see what we post or comment on those, and we can’t see what they post and comment over there.
they are gost communities hosted on this sv because how Lemmy works, and my question is what will be done about them.
No. Syncing never goes into the past. It only starts at present and moves forward.