Not at this point. How is this different from buying something in a Paris store on a credit card for 50 euros, having that billed to your credit card at the then-current exchange rate, and returning it a week later, having a credit based on the new exchange rate? Why would you expect anything different to happen?

You could have also made some money. If that had happened, how would you feel if the credit card had come after you for your ill-gotten gains?

The solution, if you think you might refund something and you think the exchange rate will work against you if that happens, is to have the cost charged in USD. That may incur other costs. Take your pick.

(FWIW, that happened to me once with a refundable ticket purchase in Australian dollars. I bought it to get into a lounge during an FT OzFest event and refunded it soon after. I figured it was the luck of the draw. That, plus the difference amounted to about the cost of two flat whites. Not worth getting upset about.)