vpn connection does not ask for password

[hmollercl]

When connecting to VPN (in my case pptp in lubuntu with the package network-manager-pptp), if the passwd is saved it works w/o problem, and lock icon appear in the systray.
But, if it is required to ask for a password, nm-tray does not ask for it and fail instantly to connect.
I still can connect via command line with:
nmcli con up id VPN_ID --ask
and it works ok with the notifier and the lock, but nm-tray does not ask for password

• Distribution & Version: Lubuntu 19.10 eoan
• Kernel Version: 5.2
• Qt Version: qt5-default/eoan 5.12.4+dfsg-4build1
• Network-Manager Version: 1.20.0-1ubuntu1 amd64
• nm-tray Version: 0.4.3

[palinek]

Fair request, but I'm currently lacking free time to dig into this...