QScreen::orientationChanged fired for only one screen in multi-screen setup (wrong xcb event monitored?)

#include <QGuiApplication>
#include <QScreen>
#include <QDebug>

int main(int argc, char *argv[])
{
     QGuiApplication a(argc, argv);
     qDebug() << "Number of screens:" << QGuiApplication::screens().size();
     qDebug() << "Primary screen:" << QGuiApplication::primaryScreen()->name();
     foreach (QScreen *screen, QGuiApplication::screens()) {
         auto name = screen->name();
         qDebug() << "Monitoring screen: " << name;
         screen->setOrientationUpdateMask(Qt::LandscapeOrientation |
                                          Qt::PortraitOrientation |
                                          Qt::InvertedLandscapeOrientation |
                                          Qt::InvertedPortraitOrientation);
         QObject::connect(screen, &QScreen::orientationChanged,
                          [=] (const Qt::ScreenOrientation &newScreenRotation) {
             qDebug() << "Orientation changed for screen" << name << ":" << newScreenRotation;
         });
     }

     return a.exec();
}