ENV stops or Dubplicated when use SceneManager

I want to reset my Environment by calling Scenemanager.LoadSceneAsync
But whenever I call it. It doesn't function well (Stop or Scene is duplicated and not start training)
I tested using ML-Agents Examples (3DBall)



Could anyone please let me know how to use LoadScene with ML-Agents?
I followed here (URL : https://github.com/Unity-Technologi...ML-Agents/Examples/Startup/Scripts/Startup.cs)