You may have to ask Mozilla, Discord and Steam if they have implemented the wayland protocol ngraham mentioned here
Can’t test because I don’t allow thunderbird to open links for security reasons, don’t use discord and steam only via the build-in interface.
But thunderbird basically doing the same, i find it always annoying that every time i get a “new mail” KDE notification clicking on that the thunderbird Window stays in the background or (most of the time) minimized and nothing happens other then that the notification disappears without a trace.