Villagers rarely can turn to Baby Zombie Villagers / Chicken Jockey

If you have a Villager get attacked by a Baby Zombie in Hard mode, it could rarely turn into a Baby Zombie Villager.

To Reproduce:
Step 1: Spawn or find a Villager
Step 2: Spawn a Baby Zombie near the Villager
Step 3: Have it turn into a Zombie
NOTICE: This rarely happens, so you have keep trying to do it