category children always empty

[pixelfoundry-dev]

when i make a query to a category, the children_count is greater than 0 but the children field is always empty.
example of query:

{
  allMagentoCategory {
    edges {
      node {
        children_count
        children {
          ... on magento__category {
            id
            name
          }
        }
      }
    }
  }
}

and the result:

{
  "data": {
    "allMagentoCategory": {
      "edges": [
        {
          "node": {
            "children_count": "21",
            "children": []
          }
        }
      ]
    }
  }
}