Armor collected from the icecrown rares and the argent crusade vendor during the shadowlands prepatch are not being marked as collected.

i know the reason blizz fix a issue when you buy the horde "plate" cape teach the alliance "cloth" cape, shift+click fix the problem

That fixed it, thanks. I had logged out/in and un/re-equipped it so I had assumed it something wrong with the data store/sync, but I completely forgot about the manual refresh so I hadn't tried it.

Have you tried Shift+Clicking on ATT minimap button/headers?