Hi, just found it upstream:
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/2668 Apparently the fix is already merged in upstream gnome 45. Thanks, -- Rémi Letot
- Bug#1053566: gnome-control-center: fails to add or edit vpn Rémi Letot
- Bug#1053566: known and fixed upstream Rémi Letot
