Piglins use Default texture instead of Programmer Art texture for some helmets

Piglins do not use the correct texture for Diamond, Iron, Chainmail and Golden and Leather helmets when using Programmer Art resource pack. Instead, they use the default helmet textures.

I have attached screenshots comparing each helmet on both a Piglin and Zombie on the Programmer Art texture pack.

I'm not sure if this also affects Netherite helmet as I couldn't tell the difference there.