[ Viewmodel Game Subsystem ] Question

I’m Blueprint developer, when I using Viewmodel Plugin, have a question or a bug?

I want use global view model collection, But add view model instanceNode is not work, and always return value false.
I try print Viewmodel Game Subsystemwith valid, it’s not valid.
butViewmodel Engine Subsystem is Valid, and Viewmodel Binding Subsystem is also Valid.

What should I do now, I don’t have any idea.