macOS Swift app with "Quit?" dialog that should accept return, but doesn't

a.md

The dialog doesn't accept "return" to quit the app.

ContentView.swift

import SwiftUI

struct ContentView: View {
    @EnvironmentObject private var appDelegate: AppDelegate
    
    var body: some View {
        let confirmQuitting = Binding<Bool>(get: {
            self.appDelegate.confirmQuit
        }, set: {
            self.appDelegate.confirmQuit = $0
        })

        VStack {
            Text("Press Cmd+q to quit")
            
        }
        .padding()
        .confirmationDialog(
            "Quit?",
            isPresented: confirmQuitting) {
                Button("Quit", role: .destructive) {
                    NSLog("quitting")
                    NSApplication.shared.reply(toApplicationShouldTerminate: true)
                }.keyboardShortcut(.defaultAction)
                
                Button("Cancel", role: .cancel) {
                    NSLog("canceling")
                    NSApplication.shared.reply(toApplicationShouldTerminate: false)
                }
                .keyboardShortcut(.cancelAction)
            } message: {
                Text("This will quit the application.")
            }.onSubmit {
                NSApplication.shared.reply(toApplicationShouldTerminate: true)
            }
    }
}

testingApp.swift

import SwiftUI

@main
struct testingApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

class AppDelegate: NSObject, NSApplicationDelegate, ObservableObject {
    @Published var confirmQuit: Bool = false
    
    func applicationDidFinishLaunching(_ notification: Notification) {
        NSLog("finished launching!!")
    }
    
    func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
        confirmQuit = true
        return .terminateLater
    }
}