In 4.3 dev 6, GetTree().Root...missing Node.

[teamjistory]

public void StartGameAsMainMenu()
	{
		GameState = Enum_GameState.Main_Menuing;

		if (MainMenu != null && MainMenu.IsInsideTree())
		{
			GetTree().Root.CallDeferred("remove_child", MainMenu);
			MainMenu = null;
		}

		MainMenu = _MainMenu.Instantiate();
		GetTree().Root.CallDeferred("add_child", MainMenu);
	}


GetTree().Root.CallDeferred("add_child", MainMenu);

===> MainMenu is null

System information

GetTree().Root.CallDeferred("add_child", MainMenu); ===> MainMenu is null

Issue description

GetTree().Root.CallDeferred("add_child", MainMenu);

===> MainMenu is null

Steps to reproduce

GetTree().Root.CallDeferred("add_child", MainMenu);

===> MainMenu is null

Minimal reproduction project (MRP)

GetTree().Root.CallDeferred("add_child", MainMenu);

===> MainMenu is null

[AThousandShips]

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