nm-openconnect-service-openconnect-helper ignores CISCO_SPLIT_EXC
There's an updated version of vpnc-script at https://gitlab.com/openconnect/vpnc-scripts/-/blob/master/vpnc-script that handles X-CSTP-Split-Exclude when connecting to Cisco Anyconnect. Clearly openconnect sets CISCO_SPLIT_EXC environment variables when connecting, but these are completely ignored by nm-openconnect-service-openconnect-helper.