glitched entity textures

I wanted to spawn the new mobs featured in the new snapshot but when i spawned them their textures -and even my own skin completely glitched out!

What I expected to happen was...:
To see the new mobs in their full beauty

What actually happened was...:
Seeing glitched out textures

Steps to Reproduce:
1. Grab a new spawnegg (even works with the old mobs in new spawneggs [Cat,Elder Guardian, etc.]]
2. Spawn them.