Another issue (since when I migrated from Plasma X11 to Plasma Wayland, earlier this month):
Often, apps will try to launch a link in a web browser, but it will simply not work and nothing will happen. I’ve seen this behavior in Audacity, in some other GUI applications that I don’t remember right now, and now in the Pacnew Checker dialog.
In fact, from the commandline, I get this:
$ xdg-open https://example.com/
qt.qpa.services: Failed to register with host portal QDBusError("org.freedesktop.portal.Error.Failed", "Could not register app ID: App info not found for 'org.kde.kioclient'")
Potentially related to this, but I haven’t tried any solution yet.
I’m using junction as the default application for handling URLs.