Magento 2 REST API : Product Price and Custom Attribute color are not reflecting in response

I am working on Magento2 [v2.4] Product integration use case.
I am creating a Product using REST API [postman] and observed that product price, color attributes are present in Request JSON but those are missing in Response received from Magento.

POST http://localhost/magento2/rest/V1/products
        
Request:
{
  "product": {
    "id": "2007",
    "sku": "20210004",
    "name": "Iphone 4",
    "price": "400",
    "status": 1,
    "extension_attributes": {
      "stock_item": {
        "qty": 4,
        "is_in_stock": "true"
      }
    },
    "custom_attributes": [
      {
        "attribute_code": "color",
        "value": 4
      }
    ]
  }
}
        
Response:
{
  "id": 2007,
  "sku": "20210004",
  "name": "Iphone 4",
  "attribute_set_id": 4,
  "status": 1,
  "visibility": 4,
  "extension_attributes": {
    "stock_item": {
      "item_id": 18,
      "product_id": 2007,
      "stock_id": 1,
      "qty": 4,
      "is_in_stock": true,
      "is_qty_decimal": false
    }
  },
  "custom_attributes": [
    {
      "attribute_code": "options_container",
      "value": "container2"
    },
    {
      "attribute_code": "url_key",
      "value": "iphone-4"
    }
   ]
}

If you look at the request and response payload, you will see that Price and Color are there in request but somehow Magento did not honor those and got missed in response.

If I want to make this work, I had to re-send same payload again. Then I could see Price and Color in response.
Could you please suggest what is the issue here?