Current build uses gtk+3, whereas gnome-control centers uses gtk4+. As a result, vpn connection editor isn't available.
Rebuilding against gtk+4 is enough to fix the issue.
rebuild with gtk4+ needed =>
networkmanager-openconnect: rebuild with gtk4+ needed
Please test networkmanager-openconnect-1.2.8-3.1.mga9.x86_64.rpm
Packages in 9/Core/Updates_testing: