Extension settings dialogs can be opened multiple times
In the Extensions application, I am able to click the gear icon to open an extension's settings dialog multiple times, which spawns multiple instances of that settings dialog. It is more apparent with "Attach Modal Dialogs" turned off in GNOME Tweaks, since that allows me to drag the top dialog off and see what is underneath it.
Other than installing Extensions, Tweaks, and RecApp, this is a fresh and up-to-date installation of Fedora 34.