GraphQL OrderUpdate endpoint doesn't update the `shippingAddress`

[adrian-z]

Whenever I use the OrderUpdate Graphql API to update the shipping address, the request is correct and a response is returned by the shipping address is not updated. 

here's a sample request I made 

{
  "query": "mutation updateOrder($input: OrderInput!) { orderUpdate(input: $input) { order { id } }",
  "variables": {
    "input": {
      "id": "gid://shopify/Order/5916109144318",
      "shippingAddress": {
      "address1": "69 Mott Street",
      "address2": "",
      "city": "New York",
      "countryCode": "US",
      "firstName": "Susann",
      "lastName": "Bussan",
      "zip": "6000"
     }
   }
  }
 }

The request was successful but the shipping address was not updated.