Form breaks with "Error rendering widget (tagger):

[j08lue]

When attempting to edit some of the demo collections in EOEPCA STAC (https://eoapi.apx.develop.eoepca.org/manager/collections/sentinel-2-iceland/edit), the form crashes with:

WidgetTagger: 'items.allowOther.type' is required for the 'tagger' widget with 'enum' options. Use the 'select' widget instead.
@.item_assets.2.roles 
{
  "label": "Roles",
  "type": "array",
  "ui:widget": "tagger",
  "items": {
    "label": "Role",
    "type": "string",
    "enum": [
      [
        "thumbnail",
        "Thumbnail"
      ],
      [
        "overview",
        "Overview"
      ],
      [
        "data",
        "Data"
      ],
      [
        "metadata",
        "Metadata"
      ]
    ]
  }
}

is this an issue with the data and / or can STAC Manager be more robust against this?