Proton recently released WireGuard support on Linux. While I really like it there’s a small UI issue with the wifi icon. When connected to VPN it looks like unknown network(?). I have confirmed the issue on two laptops. Both running Fedora 40, KDE spin.
I have noticed a similar icon issue, where instead of the question mark the lock to show a secure/VPN network just does not appear sometimes. I check and see that apparently I am connected to the VPN, but for my own peace of mind I end up reconnecting over and over again, sometimes switching servers up, just to make the icon appear correctly.