why is the biome not generated? | Bedrock Add-Ons | Page 1

why is the biome not generated? The biome does not appear but technically it is there when I write "/locate biome old..." i get a prompt with my biome ID, but when I send the command it says that the biome was not found, although it should appear very often.

code:

{
  "format_version": "1.13.0",
  "minecraft:biome": {
    "description": {
      "identifier": "old_plains"
    },
    "components": {
      "minecraft:climate": {
        "downfall": 0.4,
        "snow_accumulation": [0.0, 0.0],
        "temperature": 0.8
      },
      "minecraft:multinoise_generation_rules": {
        "target_temperature": 0.0,
        "target_humidity": 0.5,
        "target_altitude": 0.0,
        "target_weirdness": 0.0,
        "weight": 1.0 
      },
      "minecraft:overworld_height": {
        "noise_type": "default", 
        "noise_params": [0.1, 0.2]
      },
      "minecraft:surface_parameters": {
        "sea_floor_depth": 3,
        "sea_floor_material": "minecraft:gravel",
        "foundation_material": "minecraft:stone",
        "mid_material": "minecraft:dirt",
        "top_material": "minecraft:grass",
        "sea_material": "minecraft:water"
      },
      "minecraft:overworld_generation_rules": {
       
        "generate_for_climates": [
          
          ["warm", 100],

          ["cold", 100],

          ["medium", 100]
        ]
      },
      "overworld": {}
    }
  }
}

#why is the biome not generated?