My repro steps were off, sorry (I was posting from memory, there weren’t any unread topics at the time)! The issue actually occurs when I open a topic in a new tab, read to the bottom, close the tab, and then try and click Latest.
There are some unread topics now, let me take a recording to be sure I’m clear.
Edit: @eviltrout, here’s the video. (realized it didn’t record the tab area, but just believe me that I’m switching tabs)