Loading scenes only if necessary.

Assets/DLU/Scripts/SceneController.cs

@@ -18,12 +18,12 @@ public class SceneController : MonoBehaviour
 
     public void Start()
     {
-        if (SceneManager.sceneCount == 1)
+        if (!SceneManager.GetSceneByName(contextScene).isLoaded)
         {
             SceneManager.sceneLoaded += SimpleSceneLoaded;
             SceneManager.LoadSceneAsync(contextScene, LoadSceneMode.Additive);
         }
-        if (!Application.isEditor)
+        if (!Application.isEditor && !SceneManager.GetSceneByName("UI").isLoaded)
         {
             SceneManager.LoadSceneAsync("UI", LoadSceneMode.Additive);
         }