KDE NetworkManager - can create L2TP connection only once, subsequent attempts fails (solved)

After OS boot I can establish L2TP connection only for the first time, all subsequent attempts fails. To establish L2TP connection one more time I have to reload OS, logout-login doesn’t work.

nmcli/nmtui complains about missing file “/usr/lib/nm-l2tp-auth-dialog”. After installing package NetworkManager-l2tp-gnome this file appears.
Packages plasma-nm5-l2tp and NetworkManager-l2tp are not sufficient for creating working L2TP connection more than once.

Possible solutions:

  1. Add dependency to package plasma-nm5-l2tp or to NetworkManager-l2tp from NetworkManager-l2tp-gnome.
  2. Merge NetworkManager-l2tp and NetworkManager-l2tp-gnome into one package.

I’ve flied Bug 1202646](https://bugzilla.opensuse.org/show_bug.cgi?id=1202646).

FWIW, I haven’t experienced that particular issue. I connect to my workplace using L2TP, and can connect and disconnect without issue. (I was using Leap 15.3 for last year or so, now using Leap 15.4.)