The bug

When holding wheat (for example) with an animal named "Dinnerbone", its head moves incorrectly in the y direction, making it face the floor when the player is up above and face the sky when the player is below.

This has not been fixed for all animals in 21w37a, still affected are:

• sheep
• horse, donkey, mule

Reproduction steps

1. Use one of

   /summon minecraft:sheep ~ ~2 ~ {NoGravity:1b,CustomName:'"Dinnerbone"'}
   

   /summon minecraft:horse ~ ~2 ~ {NoGravity:1b,CustomName:'"Dinnerbone"'}
   

2. Hold the food of the animal, e.g. wheat or golden carrots