Scrolling through all tweets may leave unread count at 1

When using scrolling to mark tweets as read, sometimes the unread tweet count will get stuck at 1. Scrolling through all tweets doesn't help, only explicitly using the 'mark as read' button does.

I saw that a similar problem was reported before, but it was marked as fixed, so I'm reporting this again.

I'm using 1.9.2.0b (558)