Question can open or close Subscene by script?

Hello, I'm using subscene and I want to open subscene by script.
Because I found when I built project by new build configuration, it seems not opened the subscene even I opened in editor before I build.
So I've experimented in editor by using LoadSceneAsync method.
It looks like the subscene loaded well, but still in closed.
I wonder if there is a way to open subscene by script.
Thanks for reading.
By the way I'm using Entites 0.51 package and unity 2020 LTS(3.37f1).

 

ofcourse u can do that.
1. Get SceneSystem
2. SceneSystem.LoadScene( guid ) (u can get guid on go's subscene)

 

Does this mean LoadSceneAsync? cause I've got this error.

• error CS1061: 'SceneSystem' does not contain a definition for 'LoadScene' and no accessible extension method 'LoadScene' accepting a first argument of type 'SceneSystem' could be found (are you missing a using directive or an assembly reference?)

And I've already tried LoadSceneAsync which just load not open the subscene.

 

my fault,that is LoadSceneAsync, show me your code.

 

Brefly, this is my code.

Code (CSharp):

1. public SubScene prefabScene;
2.  
3. private void Start()
4. {
5.   sceneSystem = entityManager.World.GetOrCreateSystem<SceneSystem>();
6.   sceneSystem.LoadSceneAsync(prefabScene.SceneGUID);
7. }
8.  

and this is what happening on my editor.

 

Is it possible to detect when a subscene is closed? I don't see an event, and nearly all the functions in SubScene.cs are private by default so I can't inherit SubScene and override a function such as AddSceneEntities() or OnValidate() without changing the source code of SubScene.cs itself.