QJsonObject to QAssociativeIterable conversion fails

QJsonObject obj {
    { QStringLiteral("foo"), QStringLiteral("bar") }
};
    
QVariant v(obj);
    
if (v.canConvert<QVariantHash>()) {
    auto it = v.value<QAssociativeIterable>();
    it.size();
    qDebug() << "Didn't crash";
}