It does! [I am running CSSU-testing, not thumb, might that be a problem?
dbus-send --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:qwertz uint32:0 string:
run-standalone.sh dbus-send --print-reply --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:qwertz uint32:0 string:dummy