QCameraImageCapture::CaptureToBuffer has not effect

Camera::Camera(const QString &cameraName, QObject *parent)
    : QObject(parent)
    , m_camera(new QCamera(cameraName.toUtf8(), this))
    , m_capture(new QCameraImageCapture(m_camera, this))
    , m_timer(new QTimer(this))
{
    qCDebug(SI_CLT_CAM) << "Create";
    const bool canCaptureImage = m_camera->isCaptureModeSupported(QCamera::CaptureStillImage);
    qCDebug(SI_CLT_CAM) << "Capture as image supported:" << canCaptureImage;
    if (canCaptureImage)
        m_camera->setCaptureMode(QCamera::CaptureStillImage);

    QImageEncoderSettings es;
    es.setCodec("image/jpeg");
    es.setResolution(1920, 1080);
    m_capture->setEncodingSettings(es);

    const bool canCapturToBuffer = m_capture->isCaptureDestinationSupported(QCameraImageCapture::CaptureToBuffer);
    qCDebug(SI_CLT_CAM) << "Capture to buffer supported:" << canCapturToBuffer;
    if (canCapturToBuffer) {
        m_capture->setCaptureDestination(QCameraImageCapture::CaptureToBuffer);
        m_capture->setBufferFormat(QVideoFrame::Format_Jpeg);
    }

    connect(m_camera, &QCamera::stateChanged, this, [this](QCamera::State state) {
        qCDebug(SI_CLT_CAM) << "Camera state:" << state;
    });
    connect(m_camera, QOverload<QCamera::Error>::of(&QCamera::error), this, [this](QCamera::Error error) {
        if (error != QCamera::NoError)
            qCWarning(SI_CLT_CAM) << "Camera error:" << error;
    });

    connect(m_capture, QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
            this, [this](int id, QCameraImageCapture::Error error, const QString &errorString) {
        Q_UNUSED(id)
        Q_UNUSED(errorString)
        if (error != QCameraImageCapture::NoError)
            qCWarning(SI_CLT_CAM) << "Capture error:" << error;
    });
    connect(m_capture, &QCameraImageCapture::imageCaptured, this, [this](int id, const QImage &image) {
        qCDebug(SI_CLT_CAM) << "Image captured, size:" << image.size();
        emit imageCaptured(image);
    });
    connect(m_capture, &QCameraImageCapture::imageSaved, this, [this](int id, const QString &fileName) {
        Q_UNUSED(id)
        //  << DOES NOT CALLED AT ALL
        qCDebug(SI_CLT_CAM) << "Saved image:" << fileName << "removed:" << success;
    });

    connect(m_timer, &QTimer::timeout, this, [this]() {
        qCDebug(SI_CLT_CAM) << "Capture image";
        m_capture->capture(); // LEADS TO SAVE THE IMAGE TO THE FILE SYSTEM! WTF?
    });
}