{
  "feature": "clifftree:patch_grass_island",
  "placement": [
    {
      "type": "minecraft:noise_threshold_count",
      "above_noise": 6,
      "below_noise": 5,
      "noise_level": -0.8
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "WORLD_SURFACE_WG"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:matching_blocks",
        "blocks": [
          "minecraft:mycelium"
        ],
        "offset": [
          0,
          -1,
          0
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}