qmlsc: Object type * is not derived from QObject or QQmlComponent when using templates

template<class T>
class TemplateTest : public QObject
{
public:
    using QObject::QObject;
};

class SubTestObject : public TemplateTest<QObject>
{
    Q_OBJECT
    QML_ELEMENT
public:
    using TemplateTest<QObject>::TemplateTest;
};

class TestObject : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    Q_PROPERTY(SubTestObject* value READ get_value CONSTANT FINAL)
public:
    explicit TestObject(QObject *parent = nullptr);

public Q_SLOTS:
    SubTestObject* get_value() const {
        return new SubTestObject();
    }
};

error: Object type SubTestObject is not derived from QObject or QQmlComponent

class SubTestObject : public QObject
{
    Q_OBJECT
    QML_ELEMENT
public:
    using TemplateTest<QObject>::TemplateTest;
};

class SubTestObject2 : public SubTestObject
{
    Q_OBJECT
    QML_ELEMENT
public:
};

// and use SubTestObject2 as property.