QInputEvent methods are not virtual

#include <QApplication>
#include <QDebug>
#include <QKeyEvent>
#include <QMainWindow>

class TestWindow : public QMainWindow
{
protected:
	void keyPressEvent(QKeyEvent* event) override
	{
		QInputEvent* inputEvent = event;
		//returns true
		qDebug() << event->modifiers().testFlag(Qt::ControlModifier);
		//returns false
		qDebug() << inputEvent->modifiers().testFlag(Qt::ControlModifier);
	}
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
	TestWindow w;
    w.show();

    return a.exec();
}