-all item-only inventory items have a black texture (enchant gradient still intact)
-top, front, and one side of certain interactable blocks (chests, beds, signs, item frames...) have black textures and the bottom and other sides of the blocks are darkened

-all entities have certain black faces and the rest are darkened (player skins included)

-all blocks in inventory have a black face and two darkened faces

-items held in hand go between a darkened and a black texture depending on the light

This bug is produced both with and without a resource pack and I have seen in done on multiple systems in different locations on both single- and multiplayer.