[
  {
    "type": "mapgen",
    "nested_mapgen_id": "test_seedling",
    "object": {
      "mapgensize": [ 1, 1 ],
      "sealed_item": { " ": { "items": { "item": "farming_seeds", "chance": 100 }, "furniture": "f_plant_seedling" } }
    }
  }
]
