Hello! Thank you for bringing the new iPhone experience with the PushToTalk framework. I have a working walkie talkie app based on the PushToTalk framework. Everything works fine except for an intermittent bug that I face from time to time on different devices with different iOS versions, from iOS 18 to iOS 26.2 Beta. Sometimes the app goes into a state where the AVAudioInputNode input node tap returns buffers with a constant size that contain only silence. Leaving and rejoining a channel helps, but relaunching or reinstalling (from Xcode) the app does not. Rebooting the device or deleting and reinstalling the app also helps. I do not activate the audio session in my app. I only configure it on launch using setCategory(.playAndRecord, options: [.defaultToSpeaker, .allowBluetooth]) So the flow is: channelManager?.requestBeginTransmitting(channelUUID: globalChannelUUID) func channelManager( _ channelManager: PTChannelManager, channelUUID: UUID, didBeginTransmittingFrom source: PTChannelTransmitRequestSource ) func channelManager( _ channelManager: PTChannelManager, didActivate audioSession: AVAudioSession ) { /// ... installTapAndStart() } private func installTapAndStart() { let inputNode = audioEngine.inputNode let hardwareFormat = inputNode.outputFormat(forBus: 0) guard let targetFormat = AVAudioFormat( commonFormat: .pcmFormatFloat32, sampleRate: configuration.audioSampleRate, channels: configuration.audioChannelsCount, interleaved: true ) else { handleError(RecorderError.invalidAudioFormat) return } let converter = AVAudioConverter(from: hardwareFormat, to: targetFormat)! print("[QUICOpusRecorder]: installTap") inputNode.installTap(onBus: 0, bufferSize: tapBufferSize, format: hardwareFormat) { [weak self] buffer, _ in guard let self else { return } // Here I handle audio data and sometimes get silence } //... do { audioEngine.prepare() try audioEngine.start() } catch { print(" ⚠️ Audio engine start error: \(error)") handleError(error) } } Moreover, if the app is in the foreground and PushToTalk gets stuck in this “silence bug”, I can avoid relying on the PushToTalk flow and simulate audio session activation manually in code. In this case I do not request a transmission and do not use any PushToTalk related code, and the app captures audio data perfectly. Once I leave the channel and rejoin it again, the issue is fixed and I start to receive non silent buffers of varying size, as expected. It works for a while. It can work fine for a day or more, communicating without launching the app, or with the app in the foreground. But it can also go into the “silence” state 30 minutes after working normally. I have no clue why this happens. The only thing I notice is that when the app is in this “stuck silence bug” state, iOS does not play its “chirp” system sound when audio recording starts. P.S. Channel descriptor restoration code: extension PushToTalkEngine: PTChannelRestorationDelegate { public func channelDescriptor(restoredChannelUUID channelUUID: UUID) -> PTChannelDescriptor { print("☀️ \(#function) channelUUID: \(channelUUID)") Task { @MainActor in // Here I fetch more detailed channel data asynchronously do { await initChannelManagerIfNeeded(channelUUID: channelUUID) let channelDescriptor = currentChannelDescriptor() lastChannelDescriptorName = channelDescriptor.name try await channelManager?.setChannelDescriptor( channelDescriptor, channelUUID: channelUUID ) } catch { handleError(error) } } return PTChannelDescriptor(name: "Loading...", image: nil) } } private func initChannelManagerIfNeeded(channelUUID: UUID? = nil) async { guard let channelUUID = channelUUID ?? currentUser?.globalChannelUUID else { print("❌ No global channel uuid found") return } do { guard channelManager == nil else { try await channelManager?.setTransmissionMode(.halfDuplex, channelUUID: channelUUID) return } channelManager = try await PTChannelManager.channelManager( delegate: self, restorationDelegate: self ) try await channelManager?.setTransmissionMode(.halfDuplex, channelUUID: channelUUID) } catch { handleError(error) } }

For some reason Xcode can't build SwiftUI views with variadic generics. Sample code is: struct CustomView<each T>: View { var body: some View { Color.red } } Error message is empty but sometimes it's possible to get a common error with no details in log: Command SwiftEmitModule failed with a nonzero exit code What I'm doing wrong? Xcode versions: 15.1.0 beta 3 and 15.0 RC