Zombie villagers appear partially or completely invisible in some official resource packs

Summary:
In 1.20.20.20 Preview, zombie villagers now appear partially or completely invisible in the following resource packs (list may be incomplete):

• Steven Universe

• Adventure Time (Fixed)

• Ice Age (Fixed)

• Star Wars (Fixed)

• Super Cute (Fixed)

• The Nightmare Before Christmas (Fixed)

Steps to Reproduce:

1. Open a world with one of the resource packs listed above enabled

2. Spawn a zombie villager

Observed Results:
The zombie villager appears partially or completely invisible.

Expected Results:
The zombie villager should appear the same way it does in 1.20.1.

Screenshots:
1.20.40.23:

1.20.20.20:

1.20.1: