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

Accidentally reposted this issue without realizing this was already posted and was flagged as a duplicate. From the testing I’ve done, this is what posted in mine: 

Snow layers (stacked in any amount) placed by the player or spawner from weather will occasionally disappear when loading a game file, leaving one or two layers in its place. 

From the testing I have done, this only occurs to snow layers that are exposed by the sky. If the sky is obstructed by another block, then the amount of layers the player puts down will remain.

It appears this does not affect taiga biomes (even at high altitudes where snow can spawn), but does effect snowy taiga, snowy beaches, snowy plains, and frozen oceans. I have not tested other cold biomes. 

This only occurs when loading the game file. Traveling between dimensions or loading in chunks don't appear to affect this.

Most cases occur during another bug where the weather is clear but the clouds appear dark as if there is a thunderstorm, but not limited to this, may happen without this secondary bug.

In some cases, I have observed only a specific biome's snow layers being reset, while the biome adjacent and loaded in the same chunk will remain with the stacked layers placed by the player. There have also been times where random groups of layers will be reset. 

This only effects snow layers, snow blocks remain unaffected.

Any blocks that did not have a snow layer on it, will have one or two layers upon reloading the game file if the bug activates. 

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.