In my Plasma 5.5.1 installation Korganizer 5.1 doesn't show its icon in the system tray, it doesn't even appear in system tray preferences among the elements that can be configured to show or no. It worked in KDE 4, and AFAIK I didn't need to do anything special for it. Am I missing anything that should be done in Plasma 5 for Korganizer's reminder icon to show?