@Saurabh
No, delivery boy was even able to accept the order after cancelling also.
if, order is kept opened in delivery boy app before cancelling.
note: issue is not arising if delivery app is refreshed / closed & opened again after cancelling ( if not accepted by delivery boy )
if order is accepted/picked up by delivery boy after cancelling, delivery boy actions are reflecting in the store dashboard & admin panel even after cancelling order.