Merge forwardport of magento/magento2#12998 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/12998.patch (created by @srenon) based on commit(s):
  1. 3a8e692

Author: magento-engcom-team

app/code/Magento/Sales/Model/Order/CustomerManagement.php

@@ -131,6 +131,7 @@ public function create($orderId)
         $customer = $this->customerFactory->create(['data' => $customerData]);
         $account = $this->accountManagement->createAccount($customer);
         $order->setCustomerId($account->getId());
+        $order->setCustomerIsGuest(0);
         $this->orderRepository->save($order);
 
         return $account;