title: When using LoadSceneMode.Additive, the next scene with ARkit is not working properly?
body: <p>When I click ViewAR it Loads the next scene 
        <code>SceneManager.LoadScene("scene2", LoadSceneMode.Additive);</code>
  In the second scene I am using ARkit to detect a plane and using UnityARHitTestExample I am placing an object on the detected plane.I cannot place the model it is stuck in the centre but if I use <code>Loadscene.Single</code> for the above code it works smoothly.</p>
  
  <p>The reason I am using <code>LoadSceneMode.Additive</code> is that when I hit back button from the scene 2 it should go exactly where I left in scene 1.That is if my scene 1 contains two pages,at start if I hit next it reaches second page.In the second page I have ViewAR button which when clicked goes to scene 2.From scene 2 when I hit back button it should return to page 2 in scene 1.</p>
  
  <p>If I use <code>LoadSceneMode.Additive</code>I cannot place the model using HittestExample.That is when a plane is detected I cannot place the gameobject on a detected plane.It is stuck at centre.</p>
  
  <pre><code> public void ViewAR()
      {
      PlayerPrefs.SetInt("Option", Buttonoption);
      ProductDetails.SetActive(false);
      ViewARbtn.SetActive(false);
  
      StartCoroutine(Changescene());
  
  
      StartCoroutine(LoadScene2());
     // SceneManager.LoadScene("furnitres", LoadSceneMode.Additive);
  
  
  }
  
  IEnumerator Changescene()
  {
  
      SceneManager.UnloadSceneAsync("Home");
      yield return new WaitForEndOfFrame();
  
  }
  
  IEnumerator LoadScene2()
  {
      AsyncOperation asyncLoad =SceneManager.LoadSceneAsync("furnitres", LoadSceneMode.Additive); 
  
  
      // Wait until the asynchronous scene fully loads
      while (!asyncLoad.isDone)
      {
          yield return null;
      }
  
  }
  </code></pre>
  
  <p>The problem here is two scenes are interfering when I use Additive is what I think.I do not want to reload the first scene at the same time I cannot use <code>LoadSceneMode.Additive</code> .Any solution on how to get back to scene 1 when I hit back button in scene 2?I tried loading the scene 2 asynchronously.</p>