QVector/QList insists on using Copy Assignment Constructor

class TestClassConst
{
public:
    TestClassConst() = delete;
    TestClassConst(int i, const QString &str) : a(i), string(str) {}

private:
    const int a = 0;
    const QString string;
};

int main(int argc, char *argv[])
{
   QGuiApplication app(argc, argv);
    
    QVector<TestClassConst> list;
//    std::vector<TestClassConst> list;
//    std::list<TestClassConst>list;

    for(int i = 0; i < 10; ++i){
        list.append(TestClassConst{i, QString::number(i)});
    }    

   return app.exec();
}