Sheep's wool doesn't update properly when sheared

Shearing sheep doesn't display the shorn sheep.

If you log out and in, then they display correctly, but don't update

Steps to Reproduce:

1. Spawn a sheep.
2. Shear it.
3. Observe that the sheep still looks unsheared.
4. Reload the world.
5. Observe that the sheep now looks sheared, but when it eats grass, it still looks sheared.
6. Reload the world again and observe that the sheep now looks unsheared.