Horse Textures disappear and leave only certain parts i.e. the head or hooves. (This may be caused by the use of the new textures in a snapshot)

Horse Textures disappear and leave only certain parts i.e. the head or hooves

What I expected to happen was...:
Horses remain perfectly normal.

What actually happened was...:
The texture for the horse disappeared though it remained functional.

Steps to Reproduce:
1. Load version 18w50a
2. Use the new textures.
3. Find a horse (Mine was in a village)