The sheep's model is wrong

Steps to reproduce the issue:

Create a world in 1.21.90 beta and enter the world. Observe a sheep until it eats grass. You will find that the model of the sheep is wrong, and it will always "bow its head" and the leg model will not move as if it were frozen.

Expected result:

Model errors should not occur when sheep eat grass. When sheep eat grass, they should not always "bow their heads", and the model should be restored, and the model should not be frozen when sheep eat grass.

Actual result:

In the process of sheep eating, the sheep's model went wrong and the model was frozen.