VContainerSettings.Instance.RootLifetimeScope.Container is null

[lancelodliu]

Description:
Created a custom AppContext (inherits LifetimeScope) and assigned it as Root in a VContainerSettings asset. In a regular MonoBehaviour OnClick event I check:
VContainerSettings.Instance.RootLifetimeScope.Container == null
It is always true. I expected the root container to be built by then.
This only happens in 1.17.0 version but not in 1.13.2.

Environment:

Unity: 6000.0.28f1c1
VContainer: 1.17.0
Platform: Windows Editor Mode
Scripting Backend: Mono

Steps To Reproduce:

Create AppContext: LifetimeScope, place it in the scene (enabled).
Create a VContainerSettings asset, assign the AppContext as Root.
Add a MonoBehaviour (TestBehaviour) to another GameObject.
Enter Play Mode.
Observe console logs: container remains null in when I click the GameObject.

[liderako]

Also has strange behavior with RootLifetimeScope at 1.17.0, can`t find during runtime sometimes if select root as parent in LifetimeScope.

[yellowisher]

It seems you should remove the existing AppContext instance from the scene and instead use one that is instantiated at runtime.

Before #627, VContainerSettings.Instance.RootLifetimeScope was used directly as an instance.
But now, it is just a prefab. (and runtime instance is instantiated)
The commit is just after 1.13.2.