Not to confuse things, but I will just relate a recent experience. I purchased a number of CP items for the cruise that I am currently ion (EX 4-5-24) - a 3 night dining package, a boarding day specialty restaurant and a couple of port excursions - and when I later checked the reservations in my "Order History", I found a ribbon at the bottom of every one of those purchases that said something like, "Nonrefundable, cannot make changes to this purchase". This was well before any deadline date. I had no need to make any changes so I don't know if the ribbon was an error, a hint at things to come or if those purchases were truly non-refundable.
I have always known Cruise Planner purchases (in the US) to be fully refundable but I have a very bad feeling that Royal MAY be in the process of changing the ability to refund previously-purchased items. This is SPECULATION....not fact. But those purchases did, in fact, show that they were non-refundable. Whether they actually were or not is unknown since I never had any need to make a change to any of them.