It appears that a recent update of the game has completely broken how all (implemented with API scripts) icons of custom armor pieces and food items render, as they do not appear at all under any circumstance. The model of the armor appears just fine when equipped; however, in some instances a few textures of the models get affected as well, since they get removed from the game altogether as showcased down below:

Additionally; it seems that if an icon texture with any resolution greater than 16 x 16 is applied to any armor piece, that texture somehow affects how the actual model of the armor is rendered for some reason, as it shows as an item held in your offhand when equipped in any armor slot..? No idea what could be causing this since those two things normally shouldn't be related at all, but this issue disappears as soon as the texture is equal or lower to 16 x 16.

I'm also pretty certain this is not a matter that regards my coding, since this bug seemingly disappears as soon as you open a world with those items in the mobile edition- which leads me to believe a recent update on the Windows Edition of the game is what causes this visual mistake to happen in the first place. However; out of all the bugs listed, the one regarding texture resolutions is the only one that persists between every edition of the game. This issue has been present since 1.21.22, and still is even after the 1.21.23 hotfix.