I had something similar going on in Fedora Silverblue. I didn’t really want to fiddle with it at the moment, so I just uninstalled whatever I got from ProtonVPN and the update went smooth afterwards. I hope someone else can point you towards a better answer.
Historically, (at least for hobbyists/enthusiasts) Fedora and openSUSE have been a lot less popular compared to Arch, Debian and their derivatives. While not necessarily representative, Boiling Steam’s chart -in which ProtonDB’s data is used- does indicate to this as well.
Just my 2 cents.