When throwing potion of invisibility sheep (only) do not have a face just a weird white body

Put the summary of the bug you're having here

What I expected to happen was...:
What is suppose to happen is sheep are suppose to turn invisible when a potion of invisibility id thrown at them.

What actually happened was...:
When throwing potion of invisibility sheep (only) do not have a face just a plane white body.

Steps to Reproduce:
1. Go on creative
2. Get potion of invisibility
3. Splash it on sheep