Baby zombies' arms are still held at their sides when holding an item

The bug

In 26.1-snapshot-9 and earlier, baby zombie-like mobs properly held their arms out in the zombie pose while holding an item. In 26.1-snapshot-10, they started holding their arms at their sides with no animations, and MC-306612 was reported. In 26.1-pre1, this was marked fixed, and the arms were given animations. However, they are still held at their side instead of using the zombie pose.

This affects zombies, zombie villagers, husks, drowned, and zombified piglins. Zombie villagers are additionally affected by MC-306805.

How to reproduce

/summon zombie ~ ~ ~ {IsBaby:1b,NoAI:1b,equipment:{mainhand:{id:"ghast_tear"}}}

Expected behavior

Zombie should hold its arms out like it did in 26.1-snapshot-9

Observed behavior

Its arms are at its sides