Disappearing list

My WatchOS app uses two view controllers with a paged navigation from the first to the second. The first view contains a list. The second view presents a modal. When the modal is closed and I navigate back to the first view controller the list is not visible. The view controllers contains nothing but the body. What can I do to make the list always visible?

First view

struct ContentView: View {
    var body: some View {
        List {
            Text("Hello World")
            Text("Hello World again")
        }
    }
}

Second view

struct NextView: View {
    @State private var showModal = false
    var body: some View {
        Button(action: {
            self.showModal = true
        }) {
            Text("Button")
        }.sheet(isPresented: $showModal) {
            Text("Modal")
        }
    }
}