ARSessionState of Hololens only return Ready and SessionInitializing

Unity Engine
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1

Hi,
I use ARFoundation in Hololens.
After I regist the session state change:

ARSession.stateChanged += ARSession_stateChanged;
private void ARSession_stateChanged(ARSessionStateChangedEventArgs obj)
        {
           
        }

I can only recieve Ready and then SessionInitializing, even if I cover all Hololens’s camera.
Is this normal?

Unity 2020.2.2f1
ARFoundation 4.15

2

Connected with the team, and yeah, those session state values seem to be correct for Hololens.