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Https://www.raywenderlich.com/4001741-swiftui/lessons/16

https://www.raywenderlich.com/4001741-swiftui/lessons/16

I have a problem with the Picker inside of NavigationView: I can’t replicate the behavior @4’45"
The picker works only the first time: selected the item, the navigation go back on the form, but I can’t change again the selectedSnackIndex. The picker is disabled
I had try also the complete course code
My XCode is 11.3.1 version and the target iOS version is 13.2

Can you help me?

Thanks in advance