You might be right, but I understand it so that beehive is still providing the true to everyone, just lemmy.world users can't interact with the true version they will get an out of sync version with only their comments. But lurking should be still possible. Basically similar to a silent ban. You can still post but (almost) nobody can see it. (almost means only lemmy.world users)

Since it is out of sync .world users and sh.itjust.works users can also not interact on beehive posts since they both have their own out of sync copy.