QApplication::processEvents hangs when QT_MAC_DISABLE_FOREGROUND_APPLICATION_TRANSFORM is defined

When defining QT_MAC_DISABLE_FOREGROUND_APPLICATION_TRANSFORM to prevent the app to show up in the dock on macOS, further calls to QApplication::processEvents() will hangs.

#include <QApplication>
#include <QTimer>

int main(int ac, char** av)
{
    // prevent focus stealing
    qputenv("QT_MAC_DISABLE_FOREGROUND_APPLICATION_TRANSFORM", "1");

    auto application = QApplication(ac, av);
    QApplication::processEvents();
}

The application look stuck in QCocoaEventDispatcher::ensureNSAppInitialized

qt.eventdispatcher: Ensuring NSApplication is initialized
qt.eventdispatcher: NSApplication has been initialized; Stopping NSApp

This function was updated in https://codereview.qt-project.org/c/qt/qtbase/+/443326