Thread:Feedback/New messages button/FT2

Not 100% confident of the reply to this, as I don't yet know LT well enough. What I see is when I click "mark as read" on enough threads, I get a page titled "New messages" that lists no messages at all, which I presume means I've now read them all, but I still get a button saying "mark all as read".

One way or the other, if there are no unread messages, I should get a text "There are no unread messages" not a button; and if there are unread messages I should be shown them.