The Bug:
Snow blocks from snowy biomes can occasionally generate in caves.
Steps to Reproduce:
Enter the following seed and coordinates.
World Type: Single Biome, Snowcapped Peaks
Seed: -6352970218457162044
Coordinates: /execute in minecraft:overworld run tp @s 250.73 16.56 203.89 24.92 8.15
→ ❌ Notice how snow blocks from snowy biomes can occasionally generate in caves.
Expected Behavior:
The expected behavior would be that snow blocks from snowy biomes cannot generate in caves.
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[media][media]

Сan confirm in 21w37a. Although, snow caves look cool when there are a lot of snow blocks and it add variety to the world generation.
Relates to MC-236613.