Baby zombies no longer raised their arms while holding an items

Baby zombies no longer raised their arms while holding an items, they only raised their arms while not holding anything, which causes parity issue with Java Edition, since on Java baby zombies will always raised their arms regardless of whether they're holding an items or not.

Steps to reproduce:

1. Summon one of the following baby mobs: Zombie, Husk, Drowned, Zombie Villager, or Zombified Piglin

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

3. Observe the arms rotation of the baby zombies

Expected results:
Baby zombies still raised their arms, matching with the behavior found while not holding anything.

Observed results:
Baby zombies completely raised down their arms while holding an items.