If you give yourself a custom head with 3D patterns [like stuff that seems to pop out of the head] it will glitch and move the 3D patterns out of the head. When in any given inventory, the parts that give the head a depth effect will show below the head, and when placed somewhere in the bottom-right corner of the head. This isn't a game-breaking bug but it makes custom heads bad.
Linked issues
Comments 3
Duplicate of MC-140930. Upgrade to the latest snapshot.
Please upgrade your version to 19w04b