Can't seem to make persistent storage work in simulator

I'm getting started with GoNative and impressed by the simplicity of it. Great work!

I'm playing with persistent storage. I am using the following code. The device info is being outputted to the console just fine but the callbacks for the set and get persistent storage do not work. Am I misunderstanding how they work?

Setup

Mac OS X 11.5
Xcode 12.5.1
iPhone 12 Pro Max
iOS 14.5

Any ideas?