Zombified Piglin shows up in old texture.

@@unknown Yes, I use a resoure pack to show the border of chunks. After uninstall that the problem is solved. But why would this take place when using packs?

Thanks for confirming.

The game reverts the model when a texture pack designed for an old version is used. Its there to ensure that texture packs and worlds with textures based on the old model still work correctly.

You will need to contact the addon owner to update the pack.

1.17.2 affected with this nostalgic bug.