So! I was riding my horse, and came upon a river. I wanted to go hard and try to cross it with a jump, but alas, did not work. My horse and I ended up in the middle of the river, which then the game/horse kicked me off the horse, and my horse went invisible! (Once I closed then re-entered the world, he was visible again!)

What I expected to happen was...:
My horse to just, float in river! 

What actually happened was...:
My horse is invisible. He still makes noise, and can be teleported by teleporting all the horse entries around me, but you just can't see him!

Steps to Reproduce:

I was unable to re-create what happened, but what I did was:

1. Mount Horse.
2. Jump into river
3. Game dismounts you from horse
4. Horse is now invisible