abrt's retrace servers has been down for quite some time due to datacenter move, so until recently I was unable to report any problem using
gnome-abrt. I see that they are back up again: https://status.fedoraproject.org/
As for retracing, I don’t remember it ever happening automatically out of the box on Cinnamon and KDE spins (as FranciscoD pointed out, there’s still a bug report to be done), and it seems reasonable. I always make a wild guess whether I want to send a core dump to retrace server or analyze it locally, without checking ‘Don’t ask me again’.
Maybe somewhere in Gnome welcome/onboarding you agreed for automatic sending of core dumps and remote retracing? I’m just guessing, my Fedora Workstation testing has always been brief, due to Gnome 3.