Regression: QCache crash

#include <QCache>
#include <QCoreApplication>
#include <QRandomGenerator>
#include <QUuid>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QList<QString> set1{
        // hash 12997127560409977849
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1607682889889.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1607680491432.jpg?width=246&height=357"};
    QList<QString> set2{
        // hash 3776740375027953557
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1607690988464.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1607692568848.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1607690163139.jpg?width=246&height=357"};
    QList<QString> set3{
        // hash 9098347284464799501
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1598348229353.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster15k98347394491.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1598347441419.jpg?width=246&height=357"};
    QList<QString> set4{
        // hash 12229382533688088545
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1564750010324.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1564753002916.jpg?width=246&height=357"};
    QList<QString> set5{
        // hash 4785817326207999282
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1548234017423.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1548233337244.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1548231760481.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1548232389457.jpg?width=246&height=357",
        "https://msk-m10-itv01.svc.iptv.rt.ru/sdp/nc-poster1548238548599.jpg?width=246&height=357"};

    QList<QList<QString> *> sets{&set1, &set2, &set3, &set4, &set5};

    QCache<QString, int> c;
    c.setMaxCost(1024 * 1024);

    for (;;) {
        const auto n = QRandomGenerator::global()->bounded(0, 5);
        const auto i = QRandomGenerator::global()->bounded(0, sets.at(n)->size());
        const auto cost = QRandomGenerator::global()->bounded(1024, 32000);
        const auto &key = sets.at(n)->at(i);
        if (c.contains(key)) {
            const auto dummy = *c.object(key);
            Q_UNUSED(dummy)
        } else {
            c.insert(key, new int(0), cost);
        }

        c.insert(QUuid::createUuid().toString(), new int(0),
                 QRandomGenerator::global()->bounded(1024, 32000));
    }

    return a.exec();
}