QVideoWidget stopped working as QCamera viewfinder after Qt upgrade 6.2.0->6.2.1

from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QPushButton
from PySide6.QtMultimedia import QCamera, QMediaCaptureSession, QImageCapture
from PySide6.QtMultimediaWidgets import QVideoWidget
from PySide6.QtGui import QImage

class CameraWnd(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.layout = QVBoxLayout()        
        self.viewfinder = QVideoWidget(self)
        self.layout.addWidget(self.viewfinder)
        self.viewfinder.setMinimumSize(720, 405)        
        self.button = QPushButton(self)
        self.button.setText("Capture")
        self.layout.addWidget(self.button)        
        self.wnd = QWidget(self)
        self.wnd.setLayout(self.layout)
        self.setCentralWidget(self.wnd)        
        self.camera = QCamera()
        self.captureSession = QMediaCaptureSession()
        self.img_capture = QImageCapture(self.camera)
        self.captureSession.setCamera(self.camera)
        self.captureSession.setVideoOutput(self.viewfinder)
        self.captureSession.setImageCapture(self.img_capture)
        self.button.clicked.connect(self.on_button)
        self.img_capture.errorOccurred.connect(self.on_error)
        self.camera.errorOccurred.connect(self.on_cam_error)
        # self.img_capture.imageCaptured.connect(self.captured)
        self.camera.start()    
    
    def on_button(self):
        if self.img_capture.isReadyForCapture():
            print("READY")
            # self.img_capture.capture()
        else:
            print("NOT READY")    

    def on_error(self, _id, _error, error_str):
        print(f"Error: {error_str}")    

    def on_cam_error(self, _error, error_str):
        print(f"Error: {error_str}")    

    # def captured(self, id: int, img: QImage):
    #     print(id)
    #     img.save('/home/user/test.png')

def main():
    app = QApplication()    
    camera = CameraWnd()
    camera.show()    
    return app.exec()

if __name__ == '__main__':
    main()