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GNOME 50 Ends the X11 Era After Decades
(linuxiac.com)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
That explains things. Non-focused applications cannot read keystrokes on Wayland.
Since Discord is still running in X11, if you are on KDE you can enable one of these options as a workaround:
Hopefully Discord (or a wrapper for it) will eventually get proper global shortcut support, in which case you can set it right in the KDE shortcut settings.