Piglin/Zombified Piglin texture bug
If you're using a texture pack and the Piglin/Zombified Piglin texture has a higher resolution than the default Minecraft Piglin/Zombified Piglin texture, their textures will appear glitched.
It does not seem to happen with the Piglin Brute though.
(The texture pack used in the screenshot is the Greek Mythology texture pack, but it can also happen with any other texture pack with high resolution entities)
Edit: Apparently, this issue can happen with any texture pack that's not the default one, regardless of its resolution.
Linked Issues
Created Issue:
Piglin/Zombified Piglin texture bug
If you're using a texture pack and the Piglin/Zombified Piglin texture has a higher resolution than the default Minecraft Piglin/Zombified Piglin texture, their textures will appear glitched.
(The texture pack used in the screenshot is the Greek Mythology texture pack, but it can also happen with any other texture pack with high resolution entities)
If you're using a texture pack and the Piglin/Zombified Piglin texture has a higher resolution than the default Minecraft Piglin/Zombified Piglin texture, their textures will appear glitched.
It does not seem to happen with the Piglin Brute though.
(The texture pack used in the screenshot is the Greek Mythology texture pack, but it can also happen with any other texture pack with high resolution entities)
If you're using a texture pack and the Piglin/Zombified Piglin texture has a higher resolution than the default Minecraft Piglin/Zombified Piglin texture, their textures will appear glitched.
It does not seem to happen with the Piglin Brute though.
(The texture pack used in the screenshot is the Greek Mythology texture pack, but it can also happen with any other texture pack with high resolution entities)
Edit: Apparently, this issue can happen with any texture pack, regardless of its resolution.
If you're using a texture pack and the Piglin/Zombified Piglin texture has a higher resolution than the default Minecraft Piglin/Zombified Piglin texture, their textures will appear glitched.
It does not seem to happen with the Piglin Brute though.
(The texture pack used in the screenshot is the Greek Mythology texture pack, but it can also happen with any other texture pack with high resolution entities)
Edit: Apparently, this issue can happen with any texture pack that's not the default one, regardless of its resolution.
duplicates
Update from [Mod] GoldenHelmet:
Based on this report and duplicates documenting the same problem with images, this issue appears to affect all of the mash-up packs made by Minecraft that use higher resolutions than the vanilla textures. See especially MCPE-98428.
In the texture packs developed for version 1.16.10 (prior to the current one), there is a bug in the texture of piglins and zombified piglins. the piglins are badly assembled and in the zombified piglins they are pigmen. but this only happens in external texture packs not the original ones from the game.
Probably this happens because, in the old textures the one side was reflected in the other but they had to make the change for the texture of the brute piglin because their model is not symmetrical

Thank you for your report. We are now tracking this issue at
MCPE-95551.