Button Control does not show graphic until button is pressed when using a bind for the graphic

When using a bind with a graphic, the graphic does not appear until the button is pressed for the first time.

Example:

def play = ImageView{...}
def pause = ImageView {...}

Button {
            width: 50
            height: 50
            graphic: bind if(paused) play else pause
            action: function() {
                paused = not paused;
            }
        }


Sample files attached.