WPGraphQL query menuOrder Page Attribute returns null

When using your plugin in combination with WPGraphQL, I can make a graphql query to sort a custom post type by their menu order and receive the following:

{
  "data": {
    "projects": {
      "nodes": [
        {
          "title": "ABC",
          "menuOrder": null
        },
        {
          "title": "DEF",
          "menuOrder": 1
        },
        {
          "title": "GHI",
          "menuOrder": 2
        },
        {
          "title": "XYZ",
          "menuOrder": 3
        }
      ]
    }
  }
}

The first item in the response has a menu order of ‘null’ instead of 0. Is this a bug or is this supposed to happen? I would expect 0 to be first, or for all items to be shifted so that ABC is 1, DEF is 2, GHI is 3, and XYZ is 4.

When I query for all projects particularly for a Gatsby site using WP as the headless CMS, this causes the ABC project to be very last in the response, when I actually need it to be first. If I have a limit of 3 on the query, the first project ABC will be excluded.

{
  "data": {
    "projects": {
      "nodes": [
        {
          "title": "DEF",
          "menuOrder": 1
        },
        {
          "title": "GHI",
          "menuOrder": 2
        },
        {
          "title": "XYZ",
          "menuOrder": 3
        },
        {
          "title": "ABC",
          "menuOrder": null
        }
      ]
    }
  }
}