Issue Summary
When trying to create different baby variants for a mob, including both a default baby variant and biome-dependent baby variants that match their adult counterparts, the default baby variant overrides the biome-dependent baby variants.

Problem Description:

I added two biome-dependent chicken variants to the game along with three baby variants (one default baby and two biome-dependent babies). However, when the default baby chicken is specified in the properties file, it overwrites the biome-dependent baby variants, resulting in only the default one appearing. If the default baby variant is removed, the two biome-dependent baby variants display correctly.

Steps Taken:
I was adding different chicken variants to the game when this issue occurred.

Does this issue occur with OptiFine?
No.

Configuration Details
Minecraft Version: 1.21.1
Mod Loader: Fabric
ETF Version: 6.2.5
Other Mods Installed: Sodium, Animatica, EMF, Continuity, and Polytone. No mods that should interfere with mob variants.
Troubleshooting

Does the issue persist with only ETF installed?
Uncertain, but no conflicting mods are expected.

Have you checked the FAQ or Discord for known issues?
Yes.