When grass and flowers spawn in a snow biome, they replace the snow

When grass and flowers spawn in a snow biome, they replace the snow layers.

Steps to Reproduce:

1. Create a new world with the seed -321707274
2. Teleport to 267 78 253

Observed Results:
The grass and flowers replace the snow layers.

Expected Results:
The grass and flowers should generate snowlogged.

Notes:
Grass and flowers become snowlogged after reloading the world.