Invokable constructor in QT

In QT 5.15 I declare a class with an invokable constructor:

class TestClass : public QObject
{
    Q_OBJECT

public:

    Q_INVOKABLE TestClass() {}
};

Q_DECLARE_METATYPE(TestClass*)

register its type:

qRegisterMetaType<TestClass*>();

and then create it dynamically with a code like this:

int id = QMetaType::type("TestClass*");

auto metaObject = QMetaType::metaObjectForType(id);

QObject* instance = metaObject->newInstance();

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