According to the Wiki mobs don't spawn on blocks with 2-7 snow layers on them, but I'm seeing that happen. Went into a creative world to test it and they're spawning on blocks with 2-4 layers (didn't bother testing 5, 6, and 7) on them. I even set up a box with only 2 blocks of height to spawn in (not counting the snow) and covered all of the blocks in 4 layers of snow, and the mobs still spawn and immediately suffocate until they die (could be an easy mob farm but I assume this is a bug). I found this out after covering my mountain base in 2 snow layers to spawn-proof it without lighting, seems like this can really mess up some builds that use this mechanic for spawn-proofing.
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Given that there are a few issues reported with snow layers for this version (such as MCPE-60024 and MCPE-73468), I think it's more likely this was introduced recently as part of those problems.
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I'm having this issue too.
Also, don't know if it's just my imagination, but after putting two layers of snow down everywhere, they seem to spawn in specific areas regardless of my location – compared to the random distribution of before putting layers down.
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Affects 1.17.40.20
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Affects 1.17.30
It is possible that this is to allow spawning in snowy biomes where the snow can continue layering up during snowfall to 8 full layers.