Filtering emails by header didn't work

While creating a email filter, there is an option to filter by headers. If you can add a Header Name and matchers for the content. The save requests looks ok on http level.

{
  "filterActions": [
    {
      "actionKeep": [
        {}
      ],
      "actionStop": [
        {}
      ]
    }
  ],
  "active": false,
  "name": "test",
  "filterTests": [
    {
      "headerTest": [
        {
          "header": "header2",
          "stringComparison": "contains",
          "value": "header-content"
        }
      ],
      "condition": "anyof"
    }
  ]
}

After reload the setting and open the filter again, the type and header-name are missing and the filter expression always match.

Carbonio 25.12 on Ubuntu 24.04 LTS, Chrome Browser.