Bug Canvas image being stuttered when move follow player?

Question

I tried to code an image to follow the character using canvas but it jerks when moving. Is this a bug? Do you have any solution to fix it?

https://youtu.be/OnT9Pabgi2g

public class ImageScript : MonoBehaviour
{
 RectTransform mRectTransform;
 // Start is called before the first frame update
 void Start()
 {
 mRectTransform = GetComponent<RectTransform>(); 
 }
 // Update is called once per frame
 void Update()
 {
 mRectTransform.transform.position = Player.playerInstance.transform.position + new Vector3(0, 1, 0);
 }
}

• DMGregory: Do you observe this if you change Update to LateUpdate?