Snowfall doesn't render when on foot in program-changed snowy tundra

I used two programs to change the biome of an area of my superflat world: MCC Tool Chest and Amulet Editor. After it got changed I activated the rain command but the snowfall doesn't render when on foot, just when flying. I tried on both programs to check if it's a problem with the program but on both this problem happens...

To reproduce this bug, set the biome of an area to snowy plains on Amulet Editor, then after that justactivate the /toggledownfall command when on foot inside the biome.

Note: the snow layers still grow even tho the snowfall not rendering