LineItems properties is not sent during shipping rates calculation

Shopify Discussion
1

Hi,

I have used draftOrderCalculate admin API (https://shopify.dev/docs/api/admin-graphql/2023-07/mutations/draftOrderCalculate)) to test for my shipping rates, below is an example

POST /admin/api/2023-07/graphql.json HTTP/1.1
Host: HOSTNAME
X-Shopify-Access-Token: ACCESSTOKEN
Content-Type: application/graphql
Content-Length: 1554

mutation draftOrderCalculate{
    draftOrderCalculate( input: {
            purchasingEntity: {
                customerId: "gid://shopify/Customer/CUSTOMERID"
            }
            lineItems: [
                {
                    customAttributes: {
                        key: "KEY",
                        value: "VALUE"
                    },
                    variantId: "gid://shopify/ProductVariant/VARIANTID",
                    quantity: 1,
                    requiresShipping: true
                }
            ]
            shippingAddress: {
                address1: "1111662",
                address2: "0000006",
                city: "Petaling Jaya",
                country: "Malaysia",
                province: "Selangor",
                zip: "50000"
            }
        }
    ){
        calculatedDraftOrder{
            phone
            customer{
                id
                email
            }
            lineItems{
                name
                customAttributesV2{
                    key
                    value
                }
                requiresShipping
            }
            availableShippingRates{
                handle
                price{
                    amount
                    currencyCode
                }
                title
            }
            subtotalPrice
            totalTax
            totalShippingPrice
            totalPrice
        }
        userErrors {
            field
            message
        }
    }
}

The request is successful, but problem is, the lineItems customAttributes was not set.

This is the request body from Shopify:

{
  "rate": {
    "origin": {
      "country": "MY",
      "postal_code": "50450",
      "province": "KUL",
      "city": "Kuala Lumpur",
      "name": null,
      "address1": "ADDRESS1",
      "address2": "",
      "address3": null,
      "latitude": 3.1593433,
      "longitude": 101.7468678,
      "phone": "",
      "fax": null,
      "email": null,
      "address_type": null,
      "company_name": "Village Grocer - M City"
    },
    "destination": {
      "country": "MY",
      "postal_code": "50000",
      "province": "SGR",
      "city": "Petaling Jaya",
      "name": null,
      "address1": "1111362",
      "address2": "0000003",
      "address3": null,
      "latitude": null,
      "longitude": null,
      "phone": null,
      "fax": null,
      "email": null,
      "address_type": null,
      "company_name": null
    },
    "items": [
      {
        "name": "PRODUCT NAME",
        "sku": "1000584",
        "quantity": 1,
        "grams": 300,
        "price": 170,
        "vendor": "VENDOR",
        "requires_shipping": true,
        "taxable": null,
        "fulfillment_service": "manual",
        "properties": {}, // not set
        "product_id": 5609588359326,
        "variant_id": 35830533587102
      }
    ],
    "currency": "MYR",
    "locale": "en"
  }
}

My question is, is this the correct way to set properties for lineItems?
If this is the correct way, may i know why its not working?