Hi,
The patch for the "order id / order parent id" was just in the email "order status notification", not in the "order creation notification" (for the order creation) or "order notification" (when you send manually an email in the backend).
I guess that was the problem.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.