AsyncOperation.allowSceneActivation is actually static?

I have a large scene that takes a while to load, and I want to preload it while the user is navigating in the menus (which are also multiple scenes).

Lets say the scenes are called MenuScene1, MenuScene2 and BigScene and all add their content additively.

In MenuScene1 I execute the code

Code (CSharp):

1. globalOperation = SceneManager.LoadScene("BigScene", LoadSceneMode.Additive)
2. globalOperation.allowSceneActivation = false;

And then I later transition to MenuScene2 with

Code (CSharp):

1. SceneManager.LoadScene("MenuScene2", LoadSceneMode.Additive)

And when I am ready to transition to the big scene in MenuScene2 I do

Code (CSharp):

1. globalOperation.allowSceneActivation = true;

However, when I do this, MenuScene2 doesn't load! It seems that setting allowSceneActivation = false on one scene loading operation applies this to every scene in the game. Is this intentional behaviour? Is this a bug? How am I supposed to preload large scenes if there are still scene navigation actions that have to be performed before I want to activate the large scene?

 

Added a sample project to illustrate the point.
Open SmallScene1
Click on Preload BigScene
Then click on Load SmallScene2
SmallScene2 will not load, despite the logs and state claiming that it should

 

Check @Bunny83's answer in the following post (which seems logical):
http://answers.unity3d.com/answers/1073667/view.html