macOS: .setWindowCapture() and .setAudioInput() don't work together

Steps to reproduce:

• Run mictest.py
• Press record
• Talk into microphone
• Press record to stop
• Play sound file stored under ~/Music; check if sound is audible

Hello! So basically, when trying out the new WindowCapture feature on a QMediaCaptureSession, no audio works

So to be clear, I am able to record a screen capture alright, there's just no audio from my microphone which I set as the audio input

When using camera video capture instead of window capture, both video and audio work fine

Is this a bug? How do I get audio input to work while doing a window capture?

Example snippet:

 
self.captureSession = QMediaCaptureSession()
self.windowCapture = QWindowCapture()
windows = QWindowCapture.capturableWindows()
for win in windows:
print(win.description())
if "YouTube" in win.description():
self.windowCapture.setWindow(win)
self.windowCapture.start()
self.captureSession.setWindowCapture(self.windowCapture)
self.captureSession.setAudioInput(self.m_audio) # This line seems to do nothing when using WindowCapture
self.captureSession.setRecorder(self.m_mediaRecorder)
self.m_mediaRecorder.record()
// record for a bit
self.windowCapture.stop()
self.m_mediaRecorder.stop()

 
// resulting video has no sound, how do I fix that to either get sound from the window, or from my Microphone?