Limitations on property / field injection

[hdavid-bpg]

This is to inquire about the limitations of using field/properties injection.

I have this in one class:

        m_childScope = m_rootScope.CreateChild(builder => {
            builder.Register<LobbyHandler>(Lifetime.Singleton);
        });

and then in the LobbyHandler, there is a field injection to an interface(s) that was already registered in the rootScope.
I am using this through unit testing. When referencing the values in the constructor, it is null. However, when injecting it via the constructor, it passes the values. Is there something missing here or any reason for the field injection not working? I have looked
into the documentation but there are no further explanations other than the basic ones.

Thanks