AVSpeechSynthesizer not working in iOS 16

Hello there, I have a piece of code that write text-to-speech audios into local files. However it stopped working since iOS 16.

I have checked a similar post and can confirm there is a strong reference to the instance of AVSpeechSynthesizer across the app lifecycle.

This looks like a regression in AVFoundation for iOS 16. Could someone take a look and help?

let utterance = AVSpeechUtterance(string: text.text)
utterance.voice = AVSpeechSynthesisVoice(language: text.languageCode)
let soundDir = try FileManager.default.soundDir()
let fileURL = text.fileURL(baseURL: soundDir)
var avFile: AVAudioFile?

self.avSpeechSynthesizer.write(utterance) { (buffer: AVAudioBuffer) in
  //This closure is never called in iOS 16
  guard let pcmBuffer = buffer as? AVAudioPCMBuffer else {
    fatalError("unknown buffer type: \(buffer)")
  }

   if pcmBuffer.frameLength != 0 {
       if avFile == nil {
            avFile = try? AVAudioFile(
                  forWriting: fileURL,
                  settings: pcmBuffer.format.settings,
                  commonFormat: .pcmFormatInt16,
                  interleaved: false
                )
        }
        try? avFile?.write(from: pcmBuffer)
    }
}

The Xcode console output that might be relevant:

2022-09-17 14:57:44.732219-0700 CueTimer[38975:1142525] [AXTTSCommon] File did not exist at content path: (null) (null). Attempting to fallback to default voice for language: (null)

2022-09-17 14:57:44.741347-0700 CueTimer[38975:1142480] [catalog] Unable to list voice folder

2022-09-17 14:57:44.757943-0700 CueTimer[38975:1142480] [catalog] Unable to list voice folder

2022-09-17 14:57:44.761232-0700 CueTimer[38975:1142480] [catalog] Unable to list voice folder

2022-09-17 14:57:44.772778-0700 CueTimer[38975:1142480] [catalog] Unable to list voice folder

2022-09-17 14:57:44.799620-0700 CueTimer[38975:1142525] [AXTTSCommon] Error: Unable to speak. No speech service: voice: (null) identifier: (null), language: (null), resource: (null)