qt5 bug in QPrinterInfo

#include <QCoreApplication>
#include <QtPrintSupport/QPrinterInfo>
#include <QThread>
#include <QDebug>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    while (1) {
        QThread::msleep(3000);
        qDebug()<<"List of printers";
        QList<QPrinterInfo> printerList=QPrinterInfo::availablePrinters();
        foreach (QPrinterInfo printerInfo, printerList) {
            qDebug()<<printerInfo.printerName();
        }

    }
    return a.exec();
}