Dismounting horse while jumping causes horse to stay on hind legs

When the horse's 'jump' meter is high and you dismount, the horse stays on it's hind legs for a while.

How to reproduce:
1. Get any tamed horse.
2. Make the jump horse jump. (The higher the meter goes, the longer it stays.)

gif of the bug in action:
https://gfycat.com/ElectricConcernedFlyingsquirrel