problem with duration

The following query

query MyQuery {
  aircraftFromAircraftId(aircraftId: "12345") {
    flightsBetween(dateStart: "2023-01-01", dateEnd: "2024-01-01", maxResults: 3500) {
      arrival {
        airports {
          pax {
            mean
            median
          }
        }
      }
      duration {
        mean
      }
    }
  }
}

returns this:

{
  "data": {
    "aircraftFromAircraftId": {
      "flightsBetween": {
        "arrival": {
          "airports": {
            "pax": {
              "mean": 17022103.527258568,
              "median": 13558364
            }
          }
        },
        "duration": {
          "mean": null
        }
      }
    }
  },
  "errors": [
    {
      "message": "float() argument must be a string or a real number, not 'Timedelta'",
      "locations": [
        {
          "line": 13,
          "column": 9
        }
      ],
      "path": [
        "aircraftFromAircraftId",
        "flightsBetween",
        "duration",
        "mean"
      ]
    }
  ]
}

There seems to be a change in duration type in DHA