Subsonic API: getUser does not send populated folder list

The "getUser" endpoint in the Subsonic API does not return the allowed set folder mediafolders, but instead returns an empty list.

Response from a Subsonic server:

{
  "subsonic-response": {
    "status": "ok",
    "version": "1.16.1",
    "user": {
      "username": "user",
...
      "folder": [
        0,
        2,
        3
      ]
    }
  }
}

Response from funkwhale 0.17

{
  "subsonic-response": {
    "status": "ok",
    "version": "1.16.0",
    "type": "funkwhale",
    "funkwhaleVersion": "0.17",
    "user": {
      "username": "demo",
...
      "folder": [
      ]
    }
  }
}

Expected content of the "folder" list would be the same list of folder-ids as returned by the "getMusicFolders" endpoint ([1]):

{
  "subsonic-response": {
    "status": "ok",
    "version": "1.16.0",
    "type": "funkwhale",
    "funkwhaleVersion": "0.17",
    "musicFolders": {
      "musicFolder": [
        {
          "id": 1,
          "name": "Music"
        }
      ]
    }
  }
}