Villager have the inventory as their head
Steps to Reproduce:
1. create a new world world type: super flat present: overworld gamemode: creative
2. go to a village
3. Search a Villager
A Villager have the inventory as their head
A Villager with a normal head
I tried to spawn a villager with a spawn egg and the bug was still there. Even with baby villager the bug is there. The heads of witches, illiger, wandering traders are normal. The bug is not just in one world. I created another world, also flatworld overworld and the bug was there too.