After updating to 19.5 through the UI I had to reboot twice. The smart scan was not working correctly (it did not increment the percentage and stopped after a while). I tried to stop the scan but that did not work. I closed the UI and started the UI again from the systray and it stated that the scan was completed. I then ran smart scan again and the same happened.
I then did a repair from control panel and all seems to be okay now. Will try a smart scan again later to ensure all is well.
All has settled down and smart scan is running as expected.
However, when I look in notifications (as attached) and press details the smart scan starts again...