@feditips While on this subject, I recently learned that someone can start a thread with followers-only visibility and then I can see replies if someone I follow replies to the thread and then that person is replied to by someone else I follow.

(post, followers only, from someone I don't follow): invisible to me

(first reply, from someone I do follow): initially hidden from me

(reply to the reply, from someone else I follow): visible in my Home feed, clicking on it gives me above