I suspect it’s this upstream change in mutter 3.34 you have to thank for sudo support of Xwayland apps: https://gitlab.gnome.org/GNOME/mutter/commit/a8984a81c2e
That was Ubuntu bug 1652282.
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Perhaps the wrong forum (old now) but just came across this topic via a search engine and imho thank god x-org and not Wayland is being used in 20.04. Did not have very good experiences with my nVidia card and doing “updates” which included kernel updates, would break my 18.04 every time! Ridiculous. Not impressed. Again, thanks to the guys from Timeshift!