I believe Paul's final Picker in his "Solution to BetterRest" video has a mistake. It references the 2nd item in the ForEach loop as if it was the first one...

I managed to solve it by adding .tag($0) on the end of the Text item. Not sure exactly why that works, but it seems to!

Section("Daily coffee intake") {
    Picker("Number of cups" ,selection: $coffeeAmount) {
        ForEach(1..<21) {
            Text(String($0)).tag($0))
        }
    }
}