These bugs are almost certainly duplicate of https://bugs.debian.org/818366
Could you handle marking them as duplicates? (Sorry, I find it tedious to do that in Debian.) I don't think Synaptic is going to work on Wayland in time for Buster regardless of how many RC bugs we file against it. Maybe severity: important is good enough with a mention in the Release Notes that Debian GNOME uses Wayland by default and you'll need to log in to "GNOME on Xorg" if you want to use certain apps like Synaptic or most screen recording apps. Jeremy
