App native menu not visible on Android 9

Just deploy this very simple program on an Android device:

#include <QApplication>
#include <QMenuBar>
#include <QMenu>
#include <QMainWindow>
#include <QLabel>
int main( int argc, char* argv[] )
{
    QApplication app(argc, argv);
    
    QMainWindow wnd;
    wnd.menuBar()->addMenu( "File" )->addAction( "Hello World native action" );
    wnd.setCentralWidget(new QLabel("Hello"));
    wnd.show();

    return app.exec();
}

I tested various Android versions:

• On Android 6 and 10, the app menu is visible (see attached screenshot)
• On Android 9, the app menu is not visible (see attached screenshot)

App menu should always be visible.

Note: On Android 9, a workaround is too call `QCoreApplication::setAttribute(Qt::AA_DontUseNativeMenuBar);` but then menu does not look very nice on an Android device.

Note, I tested both Qt 6.2 and 6.8, I see the same issue.