'init(make:update:attachments:)' is unavailable in visionOS in Xcode 15 beta 8, but it's fine in beta 7

So there's a "grounding shadow" component we can add to any entity in Reality Composer Pro. In case my use case is Apple Vision Pro + Reality Kit: I'm wondering, by default I think I'd want to add this to any entity that's a ModelEntity in my scene... right? Should we just add this component once to the root transform? Or should we add it to any entity individually if it's a model entity? Or should we not add this at all? Will RealityKit do it for us? Or does it also depend if we use a volume or a full space?