QApplication::arguments() gives wrong result if QApplication is created in a static library

I have a static lib method which returns a QApplication pointer

QApplication *Testlib::createApp(int argc, char *argv[]) {
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    return new QApplication(argc, argv);
}

But it sometimes will crash when calling the arguments() method.

int main(int argc, char *argv[]) {
QApplication *a = Testlib::createApp(argc, argv);
qDebug() << a->arguments() << argc;
return 0;
}

Exception at 0x7ffcea35a839, code: 0xe06d7363: C++ exception, flags=0x1 (execution cannot be continued) (first chance) in Qt5Cored!QVariant::QVariant

Exception at 0x7ffcea35a839, code: 0xe06d7363: C++ exception, flags=0x1 (execution cannot be continued) in Qt5Cored!QVariant::QVariant

When it not crash, it gives an empty QStringList

() 1

I met this issue with x64 build only.
If the pointer is created in main(), nothing goes wrong.
If the Testlib::createApp returns a std::unique_ptr<QApplication>, everything works too.