As I usually work with 2 displays, sometimes the taskbar pinned icons are not being displayed on second monitor (some of them looks glitchy whereas others not being displayed at all). Unless I restart again the icons will not be displayed.
I tried to reproduce the problem, but it seems it happens randomly. I never use sleep mode. so it's not caused by it. I just shutdown and next day when I open it, they are missing from second monitor (not always) but not from the main screen.