The snow tops smooth lighting has been fixed before, but it seems to be not affected by light sources this can be clear to see in night time.
Steps to Reproduce:
Place a grass block
Place a snow layer on top of the grass block
Set time to night
Place a light source nearby
Observed Results:
The snow layer appears darker.
Expected Results:
The snow layer should not appear darker.
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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