I created a bug report here:
This was reported on the application picard, but a search of the entire error message:
“Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.”
shows many other reported instances.
The problem doesn’t occur on KDE Plasma Wayland (which isn’t quite ready for prime time) nor X environments. When running under GNOME Wayland, I only see the error message when starting from a terminal window - otherwise application appears to run fine.