Unable to reset properties in gadgets

#include <QtQml>

class MyGadget
{
    Q_GADGET
    Q_PROPERTY(int value READ value WRITE setValue RESET resetValue)

public:
    int value() const { return m_value; }
    void setValue(int value) { m_value = value; }
    void resetValue() { setValue(-1); }

    bool operator==(const MyGadget &other) const { return m_value == other.m_value; }
    bool operator!=(const MyGadget &other) const { return m_value != other.m_value; }

private:
    int m_value = -1;
};

class MyObject : public QObject
{
    Q_OBJECT
    Q_PROPERTY(MyGadget gadget MEMBER m_gadget NOTIFY gadgetChanged)

public:
    MyObject(QObject *parent = nullptr) : QObject(parent) { }

signals:
    void gadgetChanged();

private:
    MyGadget m_gadget;
};

QML_DECLARE_TYPE(MyObject)
Q_DECLARE_METATYPE(MyGadget)

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    qRegisterMetaType<MyGadget>();
    qmlRegisterType<MyObject>("MyObject", 1, 0, "MyObject");

    QQmlEngine engine;
    QQmlComponent component(&engine);
    component.setData("import QtQml 2.0; import MyObject 1.0; MyObject { gadget.value: undefined }", QUrl());
    if (!component.create())
        qDebug() << component.errorString(); // <Unknown File>:1:65: Unable to assign [undefined] to int
    return component.status() == QQmlComponent::Ready;
}

#include "main.moc"

class MyObject : public QObject
{
     ...
     Q_PROPERTY(MyGadget gadget MEMBER m_gadget RESET resetGadget NOTIFY gadgetChanged)
    void resetGadget() { qDebug("FAIL"); }
    ...
};