They had it in today's Q&A and I read it several times in the forum and in the chats that notification system is quite a mess in noble. There seems to be worked on though. Strange: it worked on my fresh install for about a day, then got more and more confused. First the counter of dekko in the launcher didn't stop counting, then teleports notification sounds disappeared, then cinnys. So it seems to be not only an issue of upgraded devices.