zombie villagers have weird textures when the developer art resource pack is enabled

What I expected to happen was...:
the zombie villager to look like a normal zombie villager from pre 1.14

What actually happened was...:
it has no hands and has strange textures circling its head

Steps to Reproduce:
1. open a world in the latest snapshot, it may crash but you just try again
2. i was in a survival world that i have updated to the recent version since 1.11
3. i enabled the developer art resource pack, with no other resource packs enabled except vanilla
4. i was hunting creepers for gunpowder when i see a zombie villager with a strange texture