ENGCOM-3564: [Forwardport]Fixed - Default tax region/state appears in customer & order data #19387

 - Merge Pull Request #19387 from ssp58bleuciel/magento2:forward-port-pull-18857
 - Merged commits:
   1. 350b56c
   2. 2854a1e

Author: magento-engcom-team

app/code/Magento/Checkout/view/frontend/web/js/model/new-customer-address.js

@@ -22,6 +22,8 @@ define([
 
         if (addressData.region && addressData.region['region_id']) {
             regionId = addressData.region['region_id'];
+        } else if (!addressData['region_id']) {
+            regionId = undefined;
         } else if (
             /* eslint-disable */
             addressData['country_id'] && addressData['country_id'] == window.checkoutConfig.defaultCountryId ||