{
  "feature": {
    "type": "minecraft:vegetation_patch",
    "config": {
      "surface": "ceiling",
      "depth": 1,
      "vertical_range": 1,
      "extra_bottom_block_chance": 0,
      "extra_edge_column_chance": 0,
      "vegetation_chance": 1,
      "xz_radius": 8,
      "replaceable": "#minecraft:features_cannot_replace",
      "ground_state": {
        "type": "minecraft:simple_state_provider",
        "state": {
          "Name": "minecraft:bedrock"
        }
      },
      "vegetation_feature": {
        "feature": {
          "type": "minecraft:simple_block",
          "config": {
            "to_place": {
              "type": "minecraft:simple_state_provider",
              "state": {
                "Name": "minecraft:air"
              }
            }
          }
        },
        "placement": [
          {
            "type": "minecraft:heightmap",
            "heightmap": "MOTION_BLOCKING"
          },
          {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
              "type": "minecraft:matching_blocks",
              "blocks": "minecraft:snow"
            }
          },
          {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
              "type": "minecraft:matching_blocks",
              "offset": [
                0,
                -1,
                0
              ],
              "blocks": [
                "minecraft:packed_ice","minecraft:blue_ice"
              ]
            }
          }
        ]
      }
    }
  },
  "placement": [
    {
      "type": "minecraft:height_range",
      "height": {
        "above_bottom": 0
      }
    },
    {
      "type": "minecraft:random_offset",
      "xz_spread": 8,
      "y_spread": 0
    }
  ]
}
