Further to comment #8, I can confirm that invoking gnome-font-viewer from the command line allows the program to start normally when invoked from either the dock or the Application overview. This is with my Eoan installation which has now been upgraded to the development version of Focal. As the reporter of the bug I'll update the bug description to reflect this work around.
Further to comment #8, I can confirm that invoking gnome-font-viewer from the command line allows the program to start normally when invoked from either the dock or the Application overview. This is with my Eoan installation which has now been upgraded to the development version of Focal. As the reporter of the bug I'll update the bug description to reflect this work around.