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The ARCamera stopped when the game was paused

I tried to assign the camera's image to another plane, but the camera stopped moving when the game paused

 

quad.GetComponent<MeshRenderer>().material = ARCamera.GetComponentInChildren<BackgroundPlaneBehaviour>().GetComponent<MeshRenderer>().material;

 

it"s worked ,bu when I press the home button to return to the game , The picture stopped moving