API return List<dynamic> instead Settings object

Describe the bug
Using the API I expect the a settings object like this:

  "settings": {
            "notify-due": "off",
            "calendar": true
        }

but what I get is this:

  "settings": []

full response:

╔╣ Response ║ GET ║ Status: 200 OK  ║ Time: 1434 ms
║  https:/my-server/apps/deck/api/v1.1/boards
╚══════════════════════════════════════════════════════════════════════════════════════════╝
╔ Body
║
║    [
║        {
║             "id": 14,
║             "title": "Packages",
║             "owner": {primaryKey: admin, uid: admin, displayname: admin, type: 0},
║             "color": "b9c8c",
║             "archived": false,
║             "labels": []
║             "acl": []
║             "permissions": {
║                 "PERMISSION_READ": true,
║                 "PERMISSION_EDIT": true,
║                 "PERMISSION_MANAGE": true,
║                 "PERMISSION_SHARE": true
║            }
║             "users": []
║             "shared": 0,
║             "stacks": []
║             "activeSessions": []
║             "deletedAt": 1727950189,
║             "lastModified": 1727950189,
║             "settings": []
║             "ETag": "8cc6b3682d5244a558339f31429fcf52"
║        },
║        {
║             "id": 19,
║             "title": "Toni's Tasks",
║             "owner": {primaryKey: admin, uid: admin, displayname: admin, type: 0},
║             "color": "f44b97",
║             "archived": false,
║             "labels": []
║             "acl": [
║                {
║                     "id": 7,
║                     "participant": {primaryKey: Toni, uid: Toni, displayname: Toni, type: 1},
║                     "type": 1,
║                     "boardId": 19,
║                     "permissionEdit": true,
║                     "permissionShare": false,
║                     "permissionManage": false,
║                     "owner": false
║                }
║             ],
║             "permissions": {
║                 "PERMISSION_READ": true,
║                 "PERMISSION_EDIT": true,
║                 "PERMISSION_MANAGE": true,
║                 "PERMISSION_SHARE": true
║            }
║             "users": []
║             "shared": 0,
║             "stacks": []
║             "activeSessions": []
║             "deletedAt": 0,
║             "lastModified": 1727983933,
║             "settings": []
║             "ETag": "dfb745d16bad3cdcfe880767e75fe237"
║        }
║    ]
║
╚══════════════════════════════════════════════════════════════════════════════════════════╝

Deck version: 1.13.2
Nextcloud version: 29.0.5

Start by reproducing the GET /apps/deck/api/v1.1/boards response against the reported Deck 1.13.2 and Nextcloud 29.0.5 versions, then trace the API entry point that serializes each board's settings field. Done means the endpoint returns the expected settings object rather than an empty list, with regression coverage if the existing API tests are found.