Ridable Animal Glitch

Put the summary of the bug you're having here

What I expected to happen was I could ride horses, pigs, and mules without fearing them glitching to cross 1 block tall obstacles, and not dying cause of it
What actually happened was...:
Any animal that can be ridden usually glitches and loses health.

Steps to Reproduce:
1. Get horse
2. Ride horse causally
3. Watch it glitch and die