I ran into the same bug, I think there is an easy fix. When swiping one of the blocks out, my cursor left the window. The event system missed the mouseup that

I ran into the same bug, I think there is an easy fix. When swiping one of the blocks out, my cursor left the window. The event system missed the mouseup that happened out-of-window. So, add another handler. onMouseLeaveContext(dropBlock())