adding bboxes changes Feature type

[TheGreatRefrigerator]

when having a defined MultiPolygon and using Meta -> add bboxes
i get a normal Polygon as a result?
With e.g. an input like

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "coordinates": [
          [
            [
              [
                8.684635298750862,
                49.41628588936615
              ],
              [
                8.695402594925838,
                49.41628588936615
              ],
              [
                8.686291805854182,
                49.419114651083845
              ],
              [
                8.684635298750862,
                49.41628588936615
              ]
            ]
          ]
        ],
        "type": "MultiPolygon"
      }
    }
  ]
}