So, here is the details I got from investigating this bug.
The error is that during first start `nm-applet` is not registering itself as a NetworkManager `secrets agent`. This is due to code in function `constructor` of the file `src/applet.c` (nm-applet code) is waiting for a `notify::shell-version` event that is never happens during the first login.
So, here is the details I got from investigating this bug.
The error is that during first start `nm-applet` is not registering itself as a NetworkManager `secrets agent`. This is due to code in function `constructor` of the file `src/applet.c` (nm-applet code) is waiting for a `notify: :shell- version` event that is never happens during the first login.
The cause for this is yet to be found out.