I'm affected as well, Ubuntu 22.04.2 and network-manager-gnome (1.24.0-1ubuntu3)
I also happen to use network-manager-openconnect-gnome (1.2.6-4) but I don't think it's relevant.
Thank you for providing the nmcli alternative (glad it accepts CIDR input compared to gnome-client)
Worth noting that it's not just adding routes that fails with the client. It actually erases all the routes if you make any other modifications and click Apply.
I'm affected as well, Ubuntu 22.04.2 and network- manager- gnome (1.24.0-1ubuntu3)
I also happen to use network- manager- openconnect- gnome (1.2.6-4) but I don't think it's relevant.
Thank you for providing the nmcli alternative (glad it accepts CIDR input compared to gnome-client)
Worth noting that it's not just adding routes that fails with the client. It actually erases all the routes if you make any other modifications and click Apply.