My last testing session was unexpected because now sometimes there is no problem.
At first I thought this could be because of easyscreencapture extension or gnome-shell restart.
But now I even managed to get it working on clean start without the extension.
So this seems like some kind of a race condition (with gnome-shell?).
Before, I was testing on triple (laptop + 2 external) monitors setup. The last testing session was on laptop only.
My last testing session was unexpected because now sometimes there is no problem.
At first I thought this could be because of easyscreencapture extension or gnome-shell restart.
But now I even managed to get it working on clean start without the extension.
So this seems like some kind of a race condition (with gnome-shell?).
Before, I was testing on triple (laptop + 2 external) monitors setup. The last testing session was on laptop only.