QMediaPlayer does not emit destroyed signal

#include <QCoreApplication>
#include <QDebug>
#include <QMediaPlayer>
#include <QTimer>

int main(int argc, char ** argv){
    QCoreApplication a(argc, argv);
    QMediaPlayer* mp  = new QMediaPlayer();
    a.connect(mp,&QMediaPlayer::destroyed,&a,[&](){
        qDebug() << "Deleted";
    });
    mp->deleteLater();
    a.exec();
}