Injecting into private field of a base class doesn't work

If I have a private field with the Inject attribute in a base class, it won’t be injected upon resolving.

public class DataManager { }

public class BaseData
{
    [Inject] private DataManager _dataManager;
}

public class LevelData : BaseData { }

...

var builder = new ContainerBuilder();
            
builder.Register<DataManager>(Lifetime.Scoped).AsSelf();
builder.Register<LevelData>(Lifetime.Scoped).AsSelf();

var container = builder.Build();

var levelData = container.Resolve<LevelData>();

At this point, levelData._dataManager is null. But if I change private to protected, the field will be injected. Is this the desired behavior?

[kawai125]

The behavior is due to the C# language specification.

VContainer’s field injection is done in the generated extension methods, but C# extension methods cannot access private variables in the type they are extending.

Constructor Injection or Method Injection can be used for Injection to private variables.

[hadashiA]

Fixed in #468 #505