Bugged texture of zombie villager with Programmer Art textures

Some of zombie villagers have bugged texture. Model has the hat but texture itself doesn't and it looks like hat made of part-transparent flesh. I use Programmer Art textures.

What I expected to happen was...:
I will have a normal zombie villager

What actually happened was...:
I have a bugged zombie villager texture

Steps to Reproduce:

1. Use Programmer Art textures
2. Spawn some zombie villagers