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This is a problem with security features in Wayland -- applications are isolated and it isn't possible to access graphical 'stacks' of other applications. And this applies to color pickers too, these tools just can't 'see' what is inside other windows.

Workaround is simple, just switch back to Xorg -- on login screen choose "GNOME on Xorg" -- https://fedoraproject.org/w/uploads/a/a6/Gdm-pick-wayland.png