If one instance defederates from another, the other instance retains a copy of what it had already cached, but any interaction on your part won't update the main/real thread on the home instance.
So if I can see new content, can post content, but can't comment on content, what does that mean?
I guess I'm trying to figure out if this is a bug, a configuration issue, or a federation issue.
Ideally, my lemmy instance behaves like it should, which under my understanding is that people can check out other lemmies, post/ comment but they look like the coming from wsb, etc..