MAGETWO-60110: [Github] Shipping Estimation Address is Merged with Customer Default Address during Checkout #6869

Author: aakimov

app/code/Magento/Checkout/view/frontend/web/js/view/cart/shipping-estimation.js

@@ -50,9 +50,13 @@ define(
                     if (address) {
                         estimatedAddress = address.isEditable() ?
                             addressConverter.quoteAddressToFormAddressData(address) :
-                            addressConverter.quoteAddressToFormAddressData(
-                                addressConverter.addressToEstimationAddress(address)
-                            );
+                            {
+                                // only the following fields must be used by estimation form data provider
+                                country_id: address.countryId,
+                                region: address.region,
+                                region_id: address.regionId,
+                                postcode: address.postcode
+                            };
                         checkoutProvider.set(
                             'shippingAddress',
                             $.extend({}, checkoutProvider.get('shippingAddress'), estimatedAddress)