Question Build problem

In my game for android I have button that loads new scene additively and previous unloads.Also, I have Buffer scene that must be always loads.
So I have 2 problems:
1.When I start game Buffer scene disappear.
2.When I press the button previous scene doesn't unload.
In the unity editor i don't have this problems.But when build they appear.
How I am load and unload scenes:

Code (CSharp):

1.     private void LoadTradeScene()
2.     {
3.         SceneManager.UnloadSceneAsync((int)Scenes.MAIN);
4.         SceneManager.LoadSceneAsync((int)Scenes.TRADE, LoadSceneMode.Additive);
5.     }

 

Solved!
Just load second Scene in the Awake() method. Unity can't loads 2 scenes at once at first start in building version, while unity editor can.