In the case of wishing to keep a connected cabins booking intact... I would think it super unlikely Royal up would work out.
I'm guessing the odds of upgrading a "connected cabin bookings" to upgraded "connecting cabin bookings" has to be astronomical.
Especially on busy sailings we are starting to see again..
I would suggest as long as cruise ship companies (and RC is not the only one doing it) treat a "multiple cabin booking" as more than 1 reservation this will be problematic to a system like Royal up.
If anyone has experience to the contrary or has seen it happen... I would love to hear about it.
Please share!