Any idea when it happens? Does it relate to breaking/fixing things or just damaging them?
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I haven't been able to pin-point when exactly it happens, but I didn't fiddle around with the hit points of the armor. If I had to guess, it might've been when opening the item link from the character's inventory. Some of my players were noticing that their AC was nowhere near what it should've been (pretty noticeable when the armor added +10 to AC).