Button does not respond when it overlaps with the safe area in SwiftUI

I want to use .safeAreaInset like UIScrollView.contentInset, I noticed that Button does not work in the safe area regions. (I want to implement like the sticky header UI.)

Other components work fine. For example, when I switched to .toggleStyle(.button), it also does not work either.

I want to show refreshable under the red border, so I can't use .padding(.top, 400).

Am I missing something? Or is this just a bug in SwiftUI? Any help would be greatly appreciated! Thanks!

import SwiftUI

struct ExampleView: View {
    @State var count = 0
    @State var toggleValue = false
    @State var sliderValue = 0.0
    @State var pickerValue = "Apple"

    var body: some View {
        ScrollView {
            VStack {
                Text("count: \(count)")

                Button {  // not worked
                    count += 1
                } label: {
                    Text("button")
                        .padding(.horizontal)
                }
                .buttonStyle(.bordered)

                Toggle(isOn: $toggleValue) {  // worked
                    Text("\(toggleValue.description)")
                }

                HStack {
                    Text("\(Int(sliderValue))")
                        .frame(width: 60)
                    Slider(value: $sliderValue, in: 0...100)  // worked
                }

                Picker("picker", selection: $pickerValue) {  // worked
                    ForEach(["Apple", "Banana", "Chocolate"], id: \.self) { text in
                        Text(text)
                            .tag(text)
                    }
                }

                Spacer(minLength: 1800)
            }
            .padding()
            .frame(maxWidth: .infinity)
        }
        .safeAreaInset(edge: .top) {
            Spacer()
                .frame(height: 400)
                .frame(maxWidth: .infinity)
                .border(.red, width: 4)
        }
    }
}

struct ExampleView_Previews: PreviewProvider {
    static var previews: some View {
        ExampleView()
    }
}