Trying to mount a pig or strider while sneaking plays hand animation

The bug

When you try to mount a pig or strider while sneaking, the hand animation will play, even though you don’t mount.

How to reproduce:

1. Spawn a pig or strider
2. Saddle it
3. Sneak
4. Right click it
5. It plays the hand animation

It does not play when trying to use a spawn egg on that mob, that is for a different mob. This bug also prevents you from using items in your hand when looking at the mob.