If beehaw blocks lemmy.world, Lemmy.world can still get the beehaw content, but any comments made by lenny.world accounts, as an example, are not visible to beehaw users, or on the beehaw instance. At least that’s how I understand it.

Not sure how it plays out if a lemmy.world user makes a comment on another instance then the beehaw user views the same 3rd server though.