Making NBT Struture spawn on surfaces in The End 1.19.2

{
  "type": "minecraft:jigsaw",
  "biomes": [
    "minecraft:end_reef"
  ],
  "step": "surface_structures",
  "spawn_overrides": {},
  "terrain_adaptation": "none",
  "start_pool": "nullscape:jellyfish/evil_jellyfish",
  "size": 1,
  "start_height": {
    "absolute": 0
  },
  "project_start_to_heightmap": "WORLD_SURFACE_WG",
  "max_distance_from_center": 80,
  "use_expansion_hack": false
}
Essentially what happens is that when my structure which spawns in a specific biome spawns over the void it goes all the way down and gets cut off but I don't want that to happen and I tried setting it to 10 but then it floats on surfaces which I want it to be grounded how do I make it remains in the ground but does not generate over the void