Talking to Ted, the break on Ubuntu/Gnome shell is Gnome shells’ fault. He wants Inkscape to be broken to remind gnome shell developers that they need to fix it.
I am not sure whether to report it to Gnome or here. The last time I tried talking to Gnome about something, they mentioned the support period was over for the version and directed me to talk to my distro which in this case is Ubuntu 20.04 and related to Inkscape 1.0.2.
If the team can do anything, it will be very helpful for many 20.04 users.
Nice to know there is a fix. When I turn ON Attach Modal Dialogues, the bug comes back. So it is definitely the setting that is influencing this behaviour. Thanks.
Just checking the Inkscape source code, Ubuntu 20.04 already has the fix for that bug. That fix has been there for 2 years but I can still see a point of contention…