This happened with me once. I booked an international air ticket on my Amex Platinum Travel Card. I got the points and the spend benefits. I had to cancel the ticket and got a refund on my card.
After setting off the card spend in that bill, the balance (which was still a credit amount) was used to calculate negative points and added to the opening points balance. This resulted in a negative closing points balance. So effectively I got a points debit on the charge reversal. However, there was no debit on the spend benefit which remained intact and which I claimed immediately.
In your case, since the points are transferred to a different account (JP), am not sure how that will play out.