This bug with gnome was appearing already in summer/harvest 2018.
Now it is there again.
When I start Chrome - there is then password login query window of Gnome popping up ?
next step is "break off" or "open lock" - it seems to be specifically of Google Chrome ?!
I have to "break off" and click 6 times then login window disappears - when opening new tab, this query pops up again.