ENGCOM-4241: Fixed #21144 Can't change customer group when placing an…

… admin order #21145

 - Merge Pull Request #21145 from gauravagarwal1001/magento2:2.3-develop1Pr
 - Merged commits:
   1. 7646850

app/code/Magento/Sales/Block/Adminhtml/Order/Create/Form/Account.php

@@ -203,7 +203,7 @@ private function extractValuesFromAttributes(array $attributes, int $storeId): a
             if (isset($defaultValue) && !isset($formValues[$code])) {
                 $formValues[$code] = $defaultValue;
             }
-            if ($code === 'group_id' && empty($defaultValue)) {
+            if ($code === 'group_id' && empty($formValues[$code])) {
                 $formValues[$code] = $this->getDefaultCustomerGroup($storeId);
             }
         }