When piglins get zombified they turn into a normal zombie pigen

Im confused.... So instead of turning into a zombified piglin, it turn into a zombie pigmen? You know that piglins turn into zombified pigmen in the overworld right? And there's no difference with zombie pigmen and zombified piglin.

Do you have any texture packs on?

Old texture packs will cause the model to revert.

There is a difference and I didn't have any texture packs the world was acting super glitchy btw

Also I know that piglins turn zombified in the overworld

must've been an issue in loading in the correct texture file. it must've loaded in the zombie pigman file in place of the zombified piglin. this bug might be similar to an older one, also posted here where the sun loaded in as the pack.png file