Polygon made a mistake in his calculations with BoundingSphere

[zhanglin]

I added a polygon to the scene, but Flyto was in the wrong place.
demo

[zhanglin]

Wrong boundingsphere, causing flyto to wrong location.

const redPolygon = viewer.entities.add({
  name: "Red polygon on surface",
  polygon: {
    hierarchy: Cesium.Cartesian3.fromDegreesArray([
      115.43061847, 27.31856824,
      115.43062375, 27.31867814,
      115.43080275, 27.31866854,
      115.43079699, 27.31856296,
      115.43061847, 27.31856824
    ]),
    material: Cesium.Color.RED,
  },
});

viewer.flyTo(redPolygon); 

Recalculated boundingsphere:

const redPolygon = viewer.entities.add({
  name: "Red polygon on surface",
  polygon: {
    hierarchy: Cesium.Cartesian3.fromDegreesArray([
      115.43061847, 27.31856824,
      115.43062375, 27.31867814,
      115.43080275, 27.31866854,
      115.43079699, 27.31856296,
      115.43061847, 27.31856824
    ]),
    material: Cesium.Color.RED,
  },
});
const positions = redPolygon.polygon.hierarchy.getValue(Cesium.JulianDate.now()).positions;
const boundingsphere = Cesium.BoundingSphere.fromPoints(positions);
viewer.camera.flyToBoundingSphere(boundingsphere);