Updated description by GoldenHelmet

Steps to reproduce

1. Create a texture pack with different textures for different zombie villager professions.
2. Apply the texture pack to a world, and open the world.
3. Spawn zombie villagers.

Expected result

Adult zombie villagers' profession textures match their professions.

Actual result

All adult zombie villagers use the farmer profession texture.

Original summary
Zombie Villager Spawn Egg

Original description
The Zombie Villager Spawn Egg only produces farmers... and baby ones spawn with no profession.

Found using custom texture pack because vanilla zombie villagers have no profession texture.