Qt6 QMouseEvent invisibly overwrite last event global position

#include <QGuiApplication>
#include <QMouseEvent>
#include <cstdio>

int main( int argc, char* argv[] )
{
    QGuiApplication app( argc, argv );
    
    QMouseEvent ev1( QEvent::MouseButtonPress, QPointF( 0.0, 0.0 ),
                     QPointF( 10.0, 10.0 ), Qt::LeftButton,
                     Qt::LeftButton, Qt::NoModifier );
    fprintf( stderr, "Event 1 at: %d x %d\n", ev1.globalX(), ev1.globalY() );
    QMouseEvent ev2( QEvent::MouseButtonPress, QPointF( 20.0, 20.0 ),
                     QPointF( 30.0, 30.0 ), Qt::LeftButton,
                     Qt::LeftButton, Qt::NoModifier );
    fprintf( stderr, "Event 1 at: %d x %d\n", ev1.globalX(), ev1.globalY() );
    return 0;
}

Event 1 at: 10 x 10
Event 1 at: 10 x 10

Event 1 at: 10 x 10
Event 1 at: 30 x 30