DisclosureGroupDisclosureBug.swift

import SwiftUI

struct ContentView: View {
    @State private var show = false
    var body: some View {
        // DisclosureGroup doesn't work here, works in `List`
        VStack {
            #warning("doesn't show content on expand at all")
            DisclosureGroup {
                Text("Content")
            } label: {
                Text("Label")
            }
            #warning("only show content in Xcode preview, doesn't show in sim or device")
            DisclosureGroup(isExpanded: $show) {
                Text("Content")
            } label: {
                Text("Label")
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}