Really getting bored with the constant: 'Jan 11 20:39:04 localhost xdg-desktop-por[3365]: Failed to get application states: GDBus.Error:org.freedesktop.portal.Error.Failed: Could not get window list: Cannot invoke method; proxy is for the well-known name org.gnome.Shell without an owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag' stuff in #Eaon #Kubuntu
Don't think I've noticed one of these so far, so looks like getting rid of xdg-dexktop-proxy-gtk might have fixed that.
Though there is mention that a newer version of xdg-desktop-proxy might fix a similar issue.