When holding a block in one's hand in a dark area, the block renders very bright, instead of being darker to fit the surrounding light. This applies to the player in first- and third person, as well as mobs.
Every Item highlights in the darkness dark!
Mobs holding items will make that item lighter or darker
Held items and dropped items glow in the dark
Holding objects in the dark, doesen't make them dark as well (screenshot)
Snow Golem head is Bright
Error with lighting
Bow lighting bug
Blocks are rendered incorrectly in inventories if a chest, ender chest, bed, shulker box or another item with special rendering is in the inventory
Item entities are rendered bright in dark areas
Blocks held by endermen are darker than usual