STEPS TO REPRODUCE
1. Purchase Mozilla VPN and export VPN configuration via mozwire as Wireguard format (another Wireguard file would presumably also work).
3. Go to KDE system settings -> Network -> Connections
4. Add new connection -> Import VPN connection -> select Wireguard file.
5. Try to edit the newly added connection in any way, e.g. by changing the name.

OBSERVED RESULT
The "Apply" button is grayed out and cannot be clicked. There is no confirmation dialog whether settings should be saved or discarded when switching to another connection.

EXPECTED RESULT
The settings can be saved by clicking the "Apply" button, making them permanent. When switching to another connection there is a dialog asking whether the settings should be saved or discarded.

SOFTWARE/OS VERSIONS
Linux: 6.5.5-1-MANJARO (64-bit)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
There is a workaround for this issue by going to /etc/NetworkManager/system-connections and editing the config files. The changes made there are then correctly applied and shown in the GUI.