magento2: [GraphQL] CreateGiftRegisty mutation throws error when using country_code in CreateGiftRegistyInput

Issue 1:CreateGiftRegistryInput throws the below error when using "countrycode" in the shippingaddress.GiftRegistryShippingAddressInput.

Run the below query:

mutation{
  createGiftRegistry(
    giftRegistry:
    {
      event_name: "100th birthday"
      message:"test birthday"
      giftRegistryTypeUid:"MQ=="
      shipping_address:{
        address_data:{
          lastname:"thampy"
          firstname:"d"
          city:"Austin"
          street:"500 test street"
          telephone:"5126861521"
          postcode:"78681"
          country_code:US
          
        }
      }
      registrants:{
        lastname:"Doe"
        email:"test.customer@gmail.com"
        firstname:"John"
      }
      privacy_settings:PUBLIC
      status:ACTIVE
      }
  )
  {
    gift_registry{
      created_at
      dynamic_attributes{label value}
      registrants{ firstname lastname email}
      owner_name
      privacy_settings
      type {label uid dynamic*attributes_metadata{attribute_group label _*typename}}
      items{product{sku name}}
      uid
    }
  }
}
{code}
#### Expected Result:

Gift registry is created.
#### Actual Result

Please note that country*_id is deprecated in favor of country_code. However, if you use country_id instead of country*code, internal server error is returned.
{code:json}
{
  "errors": <
    {
      "message": "\"countryId\" is required. Enter and try again.",
      "extensions": {
        "category": "graphql-input"
      },
      "locations": [
        {
          "line": 23,
          "column": 3
        }
      ],
      "path": [
        "createGiftRegistry"
      ]
    }
  >,
  "data": {
    "createGiftRegistry": null
  }
}
{code}
#### Issue 2.

When you run the above createGiftRegistry mutation with country*id in the shipping_address, and if you are requesting dynamic*attributes {label value} in the CreateGiftRegistryOutput, then internal server error is returned. 
 See screenshot.
 !internal server error- giftRegistry.png|thumbnail!
#### Issue 3: Make sure 'created_at" returns correct data

Remove
{code:java}
dynamic_attributes {label value}```
from CreateGiftRegistryOutput, then you can see that created_at is returning empty
 !giftRegistry-created_at.png|thumbnail!
#### P.S.

Cloud instance where the issue can be reproduced:<https://24develop-2hpekvq-t6ea5z2gu335w.us-4.magentosite.cloud/>