Zombie villagers summoned with default spawn eggs always spawn as their plains variant

Zombie villager spawn eggs with no custom entity_data component always spawn zombie villagers with the plains variant no matter the biome they are used in. All other ways zombie villagers can spawn (naturally, /summon, zombifying villagers) are not affected.

How to reproduce:

1. Go to a desert, savanna, taiga, snowy plains, jungle, swamp or any of their variants. (Any other biome is expected to have plains villagers, so there’s no issue there.)

2. Execute the following command:

   /summon minecraft:zombie_villager

   → ✔ The zombie villager’s variant matches the biome it was spawned in.

3. Take a zombie villager spawn egg from the Creative mode inventory.

4. Use it on a block.
   -> ❌ The zombie villager’s variant is the plains one.

Expected result:

The variant of zombie villagers spawned with spawn eggs would match the biome they spawned in.

Observed result:

The variant of zombie villagers spawned with spawn eggs is always the plains one.