Watch the video.
Normally, the only time the mouse cursor can be moved off the game screen in game window is when the ESC key and the inventory mode and chat bars are displayed.
This bug causes the mouse cursor to go off the game screen in the active game screen.
The click operation was taken away to the desktop screen, and the screen displayed at the case of pressed the ESC key.
I restarted game or pc and reset game and recovered os system with command, but this bug did not recover.