When a piglin looks at an item, the chestplate the piglin is wearing does not adjust to the piglin's pose

The bug

If a piglin wearing a chestplate and investigates an item, the chestplate model does not adjust to the piglin's new pose.

To reproduce

1. Summon a piglin
2. Give it a chestplate
3. Throw it an item
   → The chestplate shoulder pad doesn't adjust