Summary summarizes it, I found the glitch in creative and was able to replicate it in survival, this wouldn't be a problem if the head dropped, but it doesn't.
Environment
Optifine 1.10; Java 64x bit
MC-106898
Placing anvil on block under a head deletes head.
Resolved
Duplicate
0
Duplicate of MC-1511, please note that we only support the base, unmodded game.