Gatsby graphql filter statement is not working as expected

Question

I have a query (based on JSON input) defined in Gatsbys GraphiQL IDE which looks this trying to return only those items which have a value of less than 10 in playtime_forever:

  allContentJson(
    filter: {response: {games: {elemMatch: {playtime_forever: {lt: 10}}}}}
  ) {
    edges {
      node {
        response {
          games {
            playtime_forever
          }
        }
      }
    }
  }
}

However running this query I also receive those which are greater than 10:

{
  "data": {
    "allContentJson": {
      "edges": [
        {
          "node": {
            "response": {
              "games": [
                {
                  "playtime_forever": 0
                },
                {
                  "playtime_forever": 93
                },
                {
                  "playtime_forever": 5302
                }
              ]
            },
          }
        }
      ]
    }
  },
  "extensions": {}
}

I have this feeling this is how elemMatch is supposed to work or is there any other approach (possibly by defining types?)