iOS 16.1(b5) - AVMultiCamSession emitting silent audio frames

This seems like a new bug in iOS 16.1(b5) where AVMultiCamSession outputs silent audio frames when back & front mics have been added to it. This issue is not seen in iOS 16.0.3 or earlier. I can't reproduce this issue with AVMultiCamPIP sample code so I believe I have some AVAudioSession or AVMultiCamSession configuration in my code that is causing this. Moreover, setting captureSession.usesApplicationAudioSession = true also fixes the issue, but then I do not get the audio samples from both the microphones.

Here is the code:

    public func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection)
    {
        if let videoDataOutput = output as? AVCaptureVideoDataOutput {
            processVideoSampleBuffer(sampleBuffer, fromOutput: videoDataOutput)
        } else if let audioDataOutput = output as? AVCaptureAudioDataOutput {
            processsAudioSampleBuffer(sampleBuffer, fromOutput: audioDataOutput)
        }
    }


    private var lastDumpTime:TimeInterval?

    private func processsAudioSampleBuffer(_ sampleBuffer: CMSampleBuffer, fromOutput audioDataOutput: AVCaptureAudioDataOutput) {

        if lastDumpTime == nil {
            lastDumpTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer).seconds
        }

        let time = CMSampleBufferGetPresentationTimeStamp(sampleBuffer).seconds

        if time - lastDumpTime! >= 1.0 {
            dumpAudioSampleBuffer(sampleBuffer)
            lastDumpTime = time

        }
      }
 }

 private func dumpAudioSampleBuffer(_ sampleBuffer:CMSampleBuffer) {

        NSLog("Dumping audio sample buffer")

        var audioBufferList = AudioBufferList(mNumberBuffers: 1,
              mBuffers: AudioBuffer(mNumberChannels: 0, mDataByteSize: 0, mData: nil))

        var buffer: CMBlockBuffer? = nil

        CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, bufferListSizeNeededOut: nil, bufferListOut: &audioBufferList, bufferListSize: MemoryLayout.size(ofValue: audioBufferList), blockBufferAllocator: nil, blockBufferMemoryAllocator: nil, flags: UInt32(kCMSampleBufferFlag_AudioBufferList_Assure16ByteAlignment), blockBufferOut: &buffer)

        // Create UnsafeBufferPointer from the variable length array starting at audioBufferList.mBuffers

        withUnsafePointer(to: &audioBufferList.mBuffers) { ptr in
            let buffers = UnsafeBufferPointer<AudioBuffer>(start: ptr, count: Int(audioBufferList.mNumberBuffers))

            for buf in buffers {
                // Create UnsafeBufferPointer<Int16> from the buffer data pointer
                let numSamples = Int(buf.mDataByteSize)/MemoryLayout<Int16>.stride
                var samples = buf.mData!.bindMemory(to: Int16.self, capacity: numSamples)

                for i in 0..<numSamples {
                    NSLog("Sample \(samples[i])")
                }
            }
        }
    }

And here is the output: