If User A follows User B, he sees the posts User B writes in public groups. This is fine.
But, what he doesn't see is, if anyone comments on these posts. In fact, User A does not see any comments on posts in public groups, even, if he opens the group. Even in public groups, only members see comments. Nobody else.
I think this is pretty bad, because it gives new or casual users the impression, that there are no comments at all. Nobody would ever ask himself "are they hiding any comments from me?".
And from an admin's perspective: If I want my users to become active and to comment in groups, I should show them the comments and then say: "If you want to reply, you must become a member of this group!". But if they don't see the comments, there is no incentive.
I think this behavior of BuddyBoss should change rather quickly.