QQmlFileSelector::get returns nullptr after setting url interceptor

struct UrlInterceptor
        : QQmlAbstractUrlInterceptor
{

    QUrl intercept(const QUrl & url, DataType type) Q_DECL_OVERRIDE
    {
        Q_UNUSED(type);
        return url;
    }

};

// main:

    QQmlApplicationEngine engine;

    QPointer qmlFileSelector = QQmlFileSelector::get(&engine);
    Q_CHECK_PTR(qmlFileSelector);
    engine.setUrlInterceptor(new (std::nothrow) UrlInterceptor);
    Q_CHECK_PTR(qmlFileSelector);
    Q_ASSERT(!QQmlFileSelector::get(&engine)); // !!!