I was playing a survival world in the latest snapshot with the Programmer Art resource pack and discovered that Zombie Villagers have a somewhat buggy texture. It seems like they have a hat that matches a farmer's hat, yet it's missing most of it's pixels. They also appear to have missing arms, so they basically have sleeves only. I was then curious and found out the same bug applies in 1.16.4. This bug is also within all variations of their textures and every gamemode. I tried the new 1.14 textures and I found no errors within their texture. Please, if you have any questions, I'd be obliged to ask. Thanks!