Ok thanks for reply. I will wait for this update.
There are no issues with alipay payment gateway, I have checked log file of alipay and everything seems okay. Even payment was received by client and order status was also changed from cancelled to processing but client did not receive any email for new order.
Ya I read that 3.0 update has major issues but I have not yet updated the woocommerce plugin. I am still using the older version still got this issue.
Unfortunately its rare case that order gets cancelled after time limit reached and customer then makes payment.
Thanks a lot for your reply Wayne.