When using Mark All as Read, anywhere from 1 to 5 of the items at the end of the list remain as unread. Reloading those few stories and trying Mark All as Read again also does not work. The only way to mark them off is to individually click into each one.
The amount of scrolling before using Mark All as Read doesn’t seem to affect anything. The same issue happens whether the end of the list is at the bottom or top of the screen.
This has been happening for a couple weeks now. I guess it’s just an annoyance but man, it’s a huge annoyance!