it is kinda weird to explain. I am using Windows 10 Home Edition, the bug triggers when you left-click in-game (Inside of the Minecraft window). You don't see it in full screen, but if you go and restore the window down, and left-click it, you are going to see that in the Windows Taskbar, the minecraft icon is going to desappear and reappear. I tried spamclicking the window and sometimes you could cause the window to minimize or even to close it completely, first time it did this, I thought It was It crashed... But It was this weird-looking bug.