SUMMARY
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plasma-nm for openconnect vpn lacks some functionality offered by the latter. openconnect has a number of protocols that are not embedded into the plasma-nm editor.  In addition, due to the particular implementation, editing the connection generated by hand or by nm-applet results in breaking the cnfiguration.

STEPS TO REPRODUCE
1. Open the editor to set up a new connection
2. Observe there are missing protocols for openconnect
3. 

OBSERVED RESULT
Missing protocols

EXPECTED RESULT
A full set of openconnect protocols to set up the vpn connection

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora Linux 36
(available in About System)
KDE Plasma Version: 5.25.2 
KDE Frameworks Version:  5.94.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

openconnect currently supports the following protocols,
Set VPN protocol:
      --protocol=anyconnect       Compatible with Cisco AnyConnect SSL VPN, as well as ocserv (default)
      --protocol=nc               Compatible with Juniper Network Connect
      --protocol=gp               Compatible with Palo Alto Networks (PAN) GlobalProtect SSL VPN
      --protocol=pulse            Compatible with Pulse Connect Secure SSL VPN
      --protocol=f5               Compatible with F5 BIG-IP SSL VPN
      --protocol=fortinet         Compatible with FortiGate SSL VPN
      --protocol=array            Compatible with Array Networks SSL VPN

but plasma-nm openconnect vpn can only handle the first four, which are hard-coded in the editor and in OpenconnectSettingWidget::loadConfig. 


However, openconnect provides the function

int openconnect_get_supported_protocols(struct oc_vpn_proto **protos) 

which returns the number of supported protocols and stores them in *protos . NetworkManager uses this information to populate the drop-down menu in the UI so that new protocols become available as soon as they are implemented in openconnect.  

I believe it would not be too difficult to implement the same mechanism in plasma-nm to expand the range of choices the user has for openconnect vpn connections. At the very least, plasma-nm should be updated to include the missing protocols.