Placing damaged armor in the equipped armor slots or placing damaged armor/tools/weapons in the crafting slots inside the inventory causes some of these 8 slots to go black.
ps. Thank you guys for the feedback.
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I uploaded a screenshot of this bug I have. When I place my piece of armor inside the 2x2 crafting and then mouse over something armor related, it indeed goes black.
Confirmed.
confirmed.
ran into this one when i was putting on armor in a random order...
edit: I have found that if you have a chestplate on it makes both the leggings AND the boots slots go whack. (pretty much what jeff said)
Having a similar bug here but with enchanted armor. Clearly seen in the attachment, when putting an enchanted armor on, all the armoricons disappear. Some of them are seen when hovering over a armor slot.
Not happening with non-enchanted armor.

This is something of the same bug, no?
(1.12.2) https://www.youtube.com/watch?v=JZ6HZvSWe0g
@unknown, I don't see any bugs in that video.

[Mod] violine1101, The armor slots degrade in resolution significantly according to which slots are filled as depicted in bug.png and javaw 2013-10-24 16-25-35-49.png. The same goes for the shield slot.
Okay, now I see it. But that's not the same issue; it's the resource pack that causes it.

Ah, noted. Thank you, friend!
Wearing any piece of armor but not wearing the piece below it (example: wearing the chestplate but not the leggings) causes the box of the piece(s) below it to become darkened.