Dual update notifications since moving to 13.1

I just moved up to 13.1 after a long time on 12.x. The new version looks great, and seems a lot quicker to me in many respects. :-)

One little thing though. Previously (certainly at 12.2 / 12.3) my software update notifications came from Apper in the form of system notifications (i.e. a circle containing the number of notifications, the same place as for completed print jobs etc.)

Now I get the same, but I also get a systray "cogwheel" notification of the same updates, which I expect is coming from Yast? I don't want both. Can I suppress the "cogwheel" somehow as I'm quite happy to continue with Apper only?