To put it short- Only mobs such as creepers, Piglins, and Zombie Pigmen are messed up and are see through.

When Minecraft was updated with new looking textures in my “Beyond The Lands” texture pack- my and my cousin went out to explore what’s newly updated and I spotted a creeper looking a tad odd with its skin looking see through. I thought it was just a minor bug

for myself and I left the game and rejoined back with my cousin but it was still there. My cousin claimed that she could also see the difference, we then went to the nether to explore next since the Ancient Debris was updated with a new look. We rode over to the Crimson forest to gather some supplies and a group of Piglin attacked us, we could mostly make out their faces but it was all scrunched up- same for the Pigmen. Please find a way to fix this bug. (Sorry if the picture isn’t that helpful I could take another if needed.)