arcgis api for js 4.0 Polygon改变位置后填充色消失

官网实例shttps://developers.arcgis.com/javascript/latest/sample-code/sandbox/sandbox.html?sample=graphics-basic-3d

改变其中polygon的坐标之后，原有的填充颜色消失

        var polygon = new Polygon([
            [120.184, 51.48391, 400],
            [120.184, 51.49091, 500],
            [120.172, 51.49091, 500],
            [120.172, 51.48391, 400],
            [120.184, 51.48391, 400]
          ]),

polygon的填充色和位置有关？