perspectiveCamera's prop "quaternion" not update camera's quaternion

[keshidong]

if I update quaternion prop of perspectiveCamera, It didn't Update the camera's quaternion every time the value changes. But I set lookAt prop of perspectiveCamera, the props of lookAt keeps with the camera every time. What about let quaternion prop of perspectiveCamera consistent with ref(threejs camera)？

thank you!