Memory leak when using QT_QPA_PLATFORM=offscreen

#include <QGuiApplication>
#include <QTimer>
#include <QWindow>

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);
    QWindow window;
    window.show();

    QTimer::singleShot(0, [&]() {
        app.quit();
    });

    return app.exec();
}