REST API bugs

[dlambApLogic]

I've just noticed a bug in the REST API itself.
When PUTing an order update to https://api.maropost.com/accounts/1000/orders/find.json?where[id]={NNNN}&auth_token={XXXX}, I attempt to include order_date and coupon_code in the payload body, per the api documentation.
When I pull the order again via GET, the order_status and order_items are properly updated, but the order_date and coupon_code are not. My PUT payload body is below:

{
    "order": {
        "order_date": "2018-01-01T15:00:00-07:00",
        "order_status": "Shipped",
        "campaign_id": null,
        "coupon_code": "ccUpdated",
        "order_items": [
            {
                "item_id": "7",
                "price": "5",
                "quantity": "7",
                "description": "book",
                "adcode": "adc1",
                "category": "asdf"
            },
            {
                "item_id": "9",
                "price": "1350",
                "quantity": "1",
                "description": "movie",
                "adcode": "adc1",
                "category": "poiu"
            }
        ]
    }
}