C3 Local Storage to C2 Local Storage

I just exported my LARGE project file of C2 to find out there's a problem with C3-to-C2 Local Storage communication/process.

I'm not sure if this is already a known issue, but per my test, C3 Local Storage cannot be read by C2 Local Storage "On Item get". But why? Aren't they both use the same Storage which is the Browser storage, right?

Thank you for anyone who can clarify this to me.