Pillager patrols can spawn in the void biome

Phantoms spawning in void biomes is a duplicate of MC-127599.

Can confirm in 1.21:

This issue takes a bit of patience to reproduce. I have created clear steps to get a reliable result, although it does require waiting.

Steps to Reproduce:

1. Create a superflat world with the following preset:

   minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block;minecraft:the_void

2. Change the world difficulty to Hard

3. (optional) place a repeating command block (set to either always active, or active with redstone) with the following command:

   tp @e[type=!player] @p

4. Tick sprint the game by a large number of days

5. Wait for a patrol to spawn (can leave the game running in the background. You will know when a patrol as spawned because they will make noise once teleported to you)

Thank you for your report!
After consideration, the issue is being closed as Working as Intended.

Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.

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This is absolute utter nonsense to be Working as Intended.
Phantoms do the same and it’s not resolved as that, even though it makes more sense than the frikin Pillagers. No other mobs in any spawn process do this. What kind of person set this as resolved as Intended??