Why is My Zombified Piglin Texture Not Saving / Reverting Zombie Pigman

I am working on a texture pack which I will be submitting to MCPEDL. It is called "The Splashing Blazes", where basically I am changing the looks of the Nether. I edited the Zombie Piglin file and put it in the right folder but when I loaded the world to test it out, not only did it not save my textures, but it was the model of the old Zombie Piglin. Any idea how to fix this?

I looked it up and could not find anything: