Question InputActionPhase bug?

I'm So confused. When I get InputActionPhase in CallbackContext, I can get all the states(Started,Performed,Canceled),But when I get it in Update, it will aways be 'Started'.
By this way the 'phase' is expected:

Code (CSharp):

1. protected override void OnCreate() {
2.             gameInputControls = new GameInputControls();
3.             cameraActions = gameInputControls.Camera;
4.             moveByPointerDrag = cameraActions.MoveByPointerDrag;
5.            
6.             moveByPointerDrag.started += OnMoveByPointerDrag;
7.             moveByPointerDrag.performed += OnMoveByPointerDrag;
8.             moveByPointerDrag.canceled += OnMoveByPointerDrag;
9.         }

Code (CSharp):

1. private void OnMoveByPointerDrag(InputAction.CallbackContext context) {
2.             Debug.Log($"context.phase : {context.phase}");
3.         }

And if I get It in this way, It aways be 'Started'

Code (CSharp):

1. protected override void OnUpdate() {
2.             if(moveByPointerDrag.phase != InputActionPhase.Waiting)
3.                 Debug.Log($"moveByPointerDrag.phase : {moveByPointerDrag.phase}");
4.         }

How can I get all the states(Started,Performed,Canceled) in OnUpdate?

 

OK, I have found an other way that finish my work.