Snow layers exposed to the sky incorrectly regenerate in chunks in snowy biomes

[^snow_accumulation [ 0.0, 0.125 ].jpg]

I can't repro the issue on my device. Can you maybe export and attach the world affected?

Here is the world I used to repro the issue:

Before:

After:

affects 1.20.15 not only affects when you reload the world it also affects when you move away from chunks as shown in MCPE-152455

I request to become the owner of this report because it has been inactive for 1+ years

This problem has been reported for a long time in MCPE-11867 where it described which snow blocks and snow layers were affected.

The problem with the snow blocks was solved, although it was not solved with the snow layers.

Maybe the snow block solution could be the solution for snow layers.

@unknown:
The problem is affected when chunk is reloaded, see

So to be clear this bug makes it impossible to build or detail using snow layers, since they get deleted after an indeterminate amount of time meaning that snow layers are useless on bedrock except for temporary ambience

I have noticed that the incorrect generation changes depending on how "snow_accumulation" is configured.

biomes with:
"snow_accumulation": [ 0.0, 0.125 ]

"snow_accumulation": [ 0.25, 1.0 ]

As you can see both screenshots are tested in world

, but how is it possible that the same biome has different snow_accumulation in both screenshots? I have simply modified the biome.json with a completion so that it has the same snow_accumulation as cold taiga M

This means that MCPE-23082 is a duplicate since the cold taiga M biome has "snow_accumulation": [ 0.0, 0.125 ]

if you want you can read the biome code:

{
  "format_version": "1.13.0",
  "minecraft:biome": {
    "description": {
      "identifier": "cold_taiga_mutated"
    },
    "components": {
      "minecraft:climate": {
        "downfall": 0.4,
        "snow_accumulation": [ 0.0, 0.125 ],
        "temperature": -0.5
      },
      "minecraft:overworld_height": {
        "noise_params": [ 0.3, 0.4 ]
      },
      "minecraft:surface_parameters": {
        "sea_floor_depth": 7,
        "sea_floor_material": "minecraft:gravel",
        "foundation_material": "minecraft:stone",
        "mid_material": "minecraft:dirt",
        "top_material": "minecraft:grass",
        "sea_material": "minecraft:water"
      },

      "animal": {},
      "cold": {},
      "forest": {},
      "monster": {},
      "mutated": {},
      "taiga": {},
      // "overworld" tag cannot be present in order to match legacy behavior, but is
      // required for correct world generation -- hence: overworld_generation
      "overworld_generation": {}
    }
  }
}

Just had this effect a portion of our world. It looks as though any naturally fallen snow layers, except 1 high ones, have vanished.