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If you've changed something in the interface that causes this, please revert it. The 'Unread posts' tab is the only feasible way for a Mod like myself to browse the forums, and I'd like it to function flawlessly - much like it functioned up until this point.
EDIT: No, the thread did not have 2 pages. ALL threads have that delay, regardless of the amount of posts or pages they have. I specifically made sure I've "read" them all by scrolling down to the bottom, as can be seen in the .gif I recorded.