SwiftUI项目进入多任务模式时MeetingView丢失问题求助

我正在跟随Apple的SwiftUI教程开发Scrumdinger应用，遇到了一个异常行为：激活多任务模式时，当前的MeetingView会直接消失并返回上一级DetailView，这个问题只出现在视图树的第三个视图（MeetingView）中。

项目完整代码来自教程对应阶段的包，相关代码如下：

相关代码 #

ScrumsView #

import SwiftUI

struct ScrumsView: View {
    @Binding var scrums: [DailyScrum]
    @Environment(\.scenePhase) private var scenePhase
    @State private var isPresentingNewScrumView = false
    @State private var newScrumData = DailyScrum.Data()
    let saveAction: ()->Void
    
    @State var navigated = false
    
    var body: some View {
        List {
            ForEach($scrums) { $scrum in
                NavigationLink(destination: DetailView(scrum: $scrum)) {
                    CardView(scrum: scrum)
                }
                .listRowBackground(scrum.theme.mainColor)
            }
        }
        .navigationTitle("Daily Scrums")
        .toolbar {
            Button(action: {
                isPresentingNewScrumView = true
            }) {
                Image(systemName: "plus")
            }
            .accessibilityLabel("New Scrum")
        }
        .sheet(isPresented: $isPresentingNewScrumView) {
            NavigationView {
                DetailEditView(data: $newScrumData)
                    .toolbar {
                        ToolbarItem(placement: .cancellationAction) {
                            Button("Dismiss") {
                                isPresentingNewScrumView = false
                                newScrumData = DailyScrum.Data()
                            }
                        }
                        ToolbarItem(placement: .confirmationAction) {
                            Button("Add") {
                                let newScrum = DailyScrum(data: newScrumData)
                                scrums.append(newScrum)
                                isPresentingNewScrumView = false
                                newScrumData = DailyScrum.Data()
                            }
                        }
                    }
            }
        }
//        .onChange(of: scenePhase) { phase in
//            if phase == .inactive { saveAction() }
//        }
    }
}

struct ScrumsView_Previews: PreviewProvider {
    static var previews: some View {
        NavigationView {
            ScrumsView(scrums: .constant(DailyScrum.sampleData), saveAction: {})
        }
    }
}

DetailView #

import SwiftUI

struct DetailView: View {
    @Binding var scrum: DailyScrum
    
    @State private var data = DailyScrum.Data()
    @State private var isPresentingEditView = false
    
    @State private var starButton = false
    
    var body: some View {
        List {
            Section(header: Text("Meeting Info")) {
                NavigationLink(destination: MeetingView(scrum: $scrum)) {
                    Label("Start Meeting", systemImage: "timer")
                        .font(.headline)
                        .foregroundColor(.accentColor)
                }
                HStack {
                    Label("Length", systemImage: "clock")
                    Spacer()
                    Text("\(scrum.lengthInMinutes) minutes")
                }
                .accessibilityElement(children: .combine)
                HStack {
                    Label("Theme", systemImage: "paintpalette")
                    Spacer()
                    Text(scrum.theme.name)
                        .padding(4)
                        .foregroundColor(scrum.theme.accentColor)
                        .background(scrum.theme.mainColor)
                        .cornerRadius(4)
                }
                .accessibilityElement(children: .combine)
            }
            Section(header: Text("Attendees")) {
                ForEach(scrum.attendees) { attendee in
                    Label(attendee.name, systemImage: "person")
                }
            }
            Section(header: Text("History")) {
                if scrum.history.isEmpty {
                    Label("No meetings yet", systemImage: "calendar.badge.exclamationmark")
                }
                ForEach(scrum.history) { history in
                    NavigationLink(destination: HistoryView(history: history)) {
                        HStack {
                            Image(systemName: "calendar")
                            Text(history.date, style: .date)
                        }
                    }
                }
            }
        }
        .navigationTitle(scrum.title)
        .toolbar {
            Button("Edit") {
                isPresentingEditView = true
                data = scrum.data
            }
        }
        .sheet(isPresented: $isPresentingEditView) {
            NavigationView {
                DetailEditView(data: $data)
                    .navigationTitle(scrum.title)
                    .toolbar {
                        ToolbarItem(placement: .cancellationAction) {
                            Button("Cancel") {
                                isPresentingEditView = false
                            }
                        }
                        ToolbarItem(placement: .confirmationAction) {
                            Button("Done") {
                                isPresentingEditView = false
                                scrum.update(from: data)
                            }
                        }
                    }
            }
        }
        
        VStack {
            NavigationLink(destination: MeetingView(scrum: $scrum), isActive: $starButton) {
                Button {
                    starButton.toggle()
                } label: {
                    Text("Start Meeting")
                }
                .buttonStyle(.borderedProminent)
                .foregroundColor(scrum.theme.accentColor)
                .tint(scrum.theme.mainColor)
            }
        }
        .padding()
    }
}

struct DetailView_Previews: PreviewProvider {
    static var previews: some View {
        NavigationView {
            DetailView(scrum: .constant(DailyScrum.sampleData[0]))
        }
    }
}

MeetingView（进入非活跃状态时消失） #

import SwiftUI
import AVFoundation

struct MeetingView: View {
    @Binding var scrum: DailyScrum
    @StateObject var scrumTimer = ScrumTimer()
    @StateObject var speechRecognizer = SpeechRecognizer()
    @State private var isRecording = false
    private var player: AVPlayer { AVPlayer.sharedDingPlayer }

    
    var body: some View {
        ZStack {
            RoundedRectangle(cornerRadius: 16)
                .fill(scrum.theme.mainColor)
            VStack {
                MeetingHeaderView(secondsElapsed: scrumTimer.secondsElapsed, secondsRemaining: scrumTimer.secondsRemaining, theme: scrum.theme)
                MeetingTimerView(speakers: scrumTimer.speakers, isRecording: isRecording, theme: scrum.theme)
                MeetingFooterView(speakers: scrumTimer.speakers, skipAction: scrumTimer.skipSpeaker)
            }
        }
        .padding()
        .foregroundColor(scrum.theme.accentColor)
        
        .onAppear {
            scrumTimer.reset(lengthInMinutes: scrum.lengthInMinutes, attendees: scrum.attendees)
            scrumTimer.speakerChangedAction = {
                player.seek(to: .zero)
                player.play()
            }
            speechRecognizer.reset()
            speechRecognizer.transcribe()
            isRecording = true
            scrumTimer.startScrum()
        }
        .onDisappear {
            //            scrumTimer.stopScrum()
            //            speechRecognizer.stopTranscribing()
            //            isRecording = false
            let newHistory = History(attendees: scrum.attendees, lengthInMinutes: scrum.timer.secondsElapsed / 60, transcript: speechRecognizer.transcript)
            scrum.history.insert(newHistory, at: 0)
        }
        .navigationBarTitleDisplayMode(.inline)
    }
}

struct MeetingView_Previews: PreviewProvider {
    static var previews: some View {
        MeetingView(scrum: .constant(DailyScrum.sampleData[0]))
    }
}

请问有人知道该视图出现此异常行为的原因吗？

内容的提问来源于stack exchange，提问作者LucasC