I just got an “Unread (1)” for Shouldn’t you be able to tag with multiple categories? when /34 is my own post, so I definitely saw that thread after /33 was posted.
This has happened a few more times. Most recently for 301 Moved Permanently which I know I already saw because my reply below it is directed at it.
It is possible to reply in the middle of a 500 reply topic after reading only 100 replies, for example. So it is possible, and supported.
Aye, but in the most recent linked example (thread 6340), my comment (the last in the thread) is a reply to the next to last comment, implying that not only had I read it, but I had also scrolled it into view to click on its reply button.
Yeah I know in your case it is a bug or network issue of some kind, just pointing out that it can be valid to post a reply with lots of unread replies remaining.
This should be resolved now.