QQmlComponent::create() crashes when creeating a QML_EXTENDED_NAMESPACE(Type) object when Type is a Q_OBJECT extending a property

class Extension : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int extension READ extension WRITE setExtension NOTIFY extensionChangedWithValue FINAL)
    // ...
};

class ExtendedNamespaceByObject : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    QML_EXTENDED_NAMESPACE(Extension)

    Q_PROPERTY(int extension READ extension WRITE setExtension NOTIFY extensionChanged)
    // ...
};

import MyModule // contains ExtendedNamespaceByObject
import QtQml
ExtendedNamespaceByObject {
    extension: 10
}