I was messing around and i was riding a tamed horse in creative with armour and a saddle and i was riding the horse when I accidently shot an arrow at my horse. (shot looking strait down at horse back) It started glitching and spinning like crazy on top of the horse. When I moved my horse away the arrow fell to the ground. I started laughing at this crazy bug.

What I expected to happen was...
I expected the arrow to hurt the horse.

What actually happened was...
The arrow started glitching and spinning like crazy on the horse and when the horse moved the arrow fell to ground. (doesn't matter if horse has a saddle or horse armour)

Steps to reproduce:
1. Go into creative
2. Get a tamed horse. (won't matter if has horse armour or not)
3. Get a bow and arrow.
4. Ride horse and look directly down at the horse's back and fire the arrow.