API has wrong nullability for `order_items[].seller` in `/orders/{id}`

In some responses the Seller in the above-mentioned endpoint contains this json struct:

{
        "object": "User",
        "id": "-1",
        "name": null,
        "username": null,
        "profile_image": null,
        "updated_at": "2024-01-14T08:21:50.137Z"
}

This json struct is invalid as per the spec, as name and username are not marked as nullable