@mekkaokereke So in this situation there's a "broken" thread, but you get the new reply because you're mentioned, and the mysterious toot starts with some list of @-mentions that contains a user you've blocked? I guess Mastodon could do something to highlight blocked user @-mentions...
A similar problem happens in IRC. I /ignore someone, and then someone else says something rude that is apparently in reply to something reasonable, and it turns out I'm just missing the intervening trolling. :-/ There's also an option in my client for "...and also hide any replies to ignored users" but that sometimes just makes it worse!