Skin error
I think the archives of the textures are damaged
The skin in normal world are white and in the nether is the head of the zombie pig damaged and the body dosen't appear
Create a New World, if you have lucked, the skin get damage
Enter in the nether in the damaged skin world
Duplicate of MC-15035, please use the search function to see if your bug has already been submitted. Currently over 52% of tickets are being closed as duplicate.