network-manager-vpnc allows the value "fortigate" as vendor parameter, while the UI in plasma-nm does not. If a connection created by Gnome Network Manager has this value it will be silently changed if the connection is edited with Plasma NM. The patch only appends the new value to the combo box. Change in network-manager-vpnc: https://gitlab.gnome.org/GNOME/NetworkManager-vpnc/-/commit/cfc0146f4807cf680c3868188d3ad71343d0b4dd Upstream patch: https://invent.kde.org/plasma/plasma-nm/-/merge_requests/471