Reading their comment they suggest that Gtk is doing the right thing but gnome-shell is the one setting the key value on wayland and currently always claiming that desktop isn't handled. The suggestion is that gnome-shell should be updated, or maybe the desktop extension if it's technical doable for it to override the value. Reassigning to gnome-shell as a first step now. Ideally someone would report it upstream on the shell or desktop icons extension to get their opinion
Reading their comment they suggest that Gtk is doing the right thing but gnome-shell is the one setting the key value on wayland and currently always claiming that desktop isn't handled. The suggestion is that gnome-shell should be updated, or maybe the desktop extension if it's technical doable for it to override the value. Reassigning to gnome-shell as a first step now. Ideally someone would report it upstream on the shell or desktop icons extension to get their opinion