Grass blocks can generate with snowy block state

Grass blocks that have "snowy" block state can generate in the world, even there is no snow, snow block or powder snow above it. Strangely, this is not happening when i use /tp command to go there.

seed: -8730405629769185297

cords: /execute in minecraft:overworld run tp @s -281.90 70.53 -77.28 -1169.27 39.60