Baby zombies arms does not rotate when walking around while holding an item

When baby zombies held an item, and then they start walking around, their arms does not rotate at all and stays still, which looks weird, this also does not match Java Edition.

Steps to reproduce:

1. Summon a baby zombie, baby husk, baby zombified piglin, or gurgle

2. Run this command: /replaceitem entity @e[type=!player] slot.weapon.mainhand 0 grass_block

3. Wait until they start walking

4. Observe

Expected results:
Their arms moves back and forth.

Observed results:
Their arms stays still.