{
  "feature": "minecraft:twisting_vines",
  "placement": [
    {
      "type": "minecraft:count",
      "count": 10
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:height_range",
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": {
          "below_top": 0
        },
        "min_inclusive": {
          "above_bottom": 0
        }
      }
    },
    {
      "type": "minecraft:biome"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:matching_block_tag",
            "tag": "minecraft:air"
          },
          {
            "type": "minecraft:matching_blocks",
            "blocks": [
              "minecraft:netherrack",
              "minecraft:warped_nylium",
              "minecraft:warped_wart_block"
            ],
            "offset": [
              0,
              -1,
              0
            ]
          }
        ]
      }
    },
    {
      "type": "minecraft:count",
      "count": 64
    },
    {
      "type": "minecraft:offset",
      "x": {
        "type": "minecraft:uniform",
        "max_inclusive": 8,
        "min_inclusive": -8
      },
      "y": {
        "type": "minecraft:uniform",
        "max_inclusive": 4,
        "min_inclusive": -4
      },
      "z": {
        "type": "minecraft:uniform",
        "max_inclusive": 8,
        "min_inclusive": -8
      }
    },
    {
      "type": "minecraft:offset",
      "x": 0,
      "y": -1,
      "z": 0
    },
    {
      "type": "minecraft:environment_scan",
      "direction_of_search": "down",
      "max_steps": 32,
      "target_condition": {
        "type": "minecraft:not",
        "predicate": {
          "type": "minecraft:matching_block_tag",
          "tag": "minecraft:air"
        }
      }
    },
    {
      "type": "minecraft:offset",
      "x": 0,
      "y": 1,
      "z": 0
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:matching_block_tag",
            "tag": "minecraft:air"
          },
          {
            "type": "minecraft:matching_blocks",
            "blocks": [
              "minecraft:netherrack",
              "minecraft:warped_nylium",
              "minecraft:warped_wart_block"
            ],
            "offset": [
              0,
              -1,
              0
            ]
          }
        ]
      }
    }
  ]
}