title: WooCommerce Get Cart query always return blank result with GraphQL
body: <p>As you can see below I fetch the GET_CART query when I completed the addTOCart mutation, it will have the product inside it, but not able to get cart with query and  providing the wooCommerce Session JWT token and the authentication token in the HTTP headers.</p>
  <p>What I expect: Therefore what I expect should be, initial it will be a blank cart(subtotal 0.00) , then when successful mutation, it will have the product inside it.
  End Result: But end up, everytime the GET_CART query will return the blank cart even the addToCart mutation is successful.</p>
  <p>I have a mutation to Add to cart like this:</p>
  <pre><code> mutation ($input: AddToCartInput!) {
          addToCart(input: $input) {
            cartItem {
              key
              product {
                id
              }
              variation {
                id
                variationId
                name
              }
              quantity
              total
              subtotal
              subtotalTax
            }
          }
        }
  </code></pre>
  <p>Add To Cart Input Variable:</p>
  <pre><code>{
          &quot;clientMutationId&quot;:&quot;myid&quot;,
          &quot;productId&quot;: 11745,
          &quot;quantity&quot;: 1
          
      } 
  </code></pre>
  <p>This is Get Cart query:</p>
  <pre><code>  query GetCart {
          cart {
            contents {
              nodes {
                key
                product {
                  id
                  productId
                  name
                  description
                }
                variation {
                  id
                  variationId
                  name
                  description
                } 
                quantity
                total
                subtotal
                subtotalTax
              }
            }
          
            subtotal
            subtotalTax
          }
        }
  </code></pre>
  <p>Postman response:</p>
  <pre><code>{
      &quot;data&quot;: {
          &quot;cart&quot;: {
              &quot;chosenShippingMethod&quot;: null,
              &quot;shippingTotal&quot;: &quot;₹0.00&quot;,
              &quot;subtotal&quot;: &quot;₹0.00&quot;,
              &quot;subtotalTax&quot;: &quot;₹0.00&quot;,
              &quot;total&quot;: &quot;₹0.00&quot;,
              &quot;totalTax&quot;: &quot;₹0.00&quot;
          }
      }
  </code></pre>