I'm NOT able to put a CHEST on a donkey please check it

What I expected to happen was that i will be able to put a chest on the donkey i had tied to a lead on a pole

What actually happened was the game had compeletly crashed lol

Steps to Reproduce:
1. Spawn horses till you get a donkey
2. Tame the donkey
3. sit on it, take a chest the put in on the bottom-middle of the empty space where the white box shines
4. The game shall crash