When feeding a tamed horse or llama with a golden apple/carrot or hay bale, the cursor moves to the right

The bug

When I was feeding my horses with golden apple, which are tamed and named, I expected that they would just open their mouths to show happiness. But the cursor instantly moved to the right, moving out of focus. I did not see if they accepted the apple.

How to reproduce

1. In creative mode, summon a horse.
2. Tame the horse and name it.
3. Put golden apple in your hotkey.
4. Right-click the horse while the golden apple is in hand.

Note that this is not MC-61535.

Code analysis

Code analysis by Marcono1234 can be found in this comment.

Suggested fix by [Mojang] Gnembon can be found in fix_chestHorseChangingDirection.PNG; explanation can be found in this comment.