Hm, kind of but not entirely depending on whatever way the wind blows? It’s weird. At baseline it should do that, and most of the time it does. But if the defederations aren’t mutual you sometimes end up with comments being pulled from defederated instances but never federating back to the commenters home instance so they never see it. It’s a very bad means of functioning and has some nasty potential for harassment, but is an embedded issue within the protocol lemmy relies rather than lemmy itself. That is why many instances do mutual block across the fediverse.