There is no separate way to query discretionary-cancellation or quick-refund orders specifically.
However, you can use the [Query Return/Cancel Request List] API to see if an order that was cancelled or returned was a discretionary cancellation or a quick refund.
Find out by checking the following attributes in the json data query.
Type of confirmation
For more details, please refer to the [Query Return/Cancel Request List] document.
Going forward, orders that are cancelled while in 'Product in Preparation' status are refunded immediately.
Even if you see "completeConfirmType=CS_CONFIRM", "cancelCompleteUser=3P_CACNEL" indicates that the order has been cancelled by the Customer while in 'Product in Preparation' status.