Generic classes are not well generated in factory

[opcoach]

For instance, the factory contains :

public interface ProjectFactory extends MProjectFactory
{

/** Specialize the eINSTANCE initialization with the new interface type 
  * (overridden in the override_factory extension)
*/
ProjectFactory eINSTANCE = ProjectFactoryImpl.init();

public Person createPerson();
public Project createProject();
public Task createTask();
public Company createCompany();

---> public Folder createFolder();
public TaskFolder createTaskFolder();
}

[opcoach]

Actually EMF generated for interface :

<T> Folder<T> createFolder();

and for implementation :

public <T> Folder<T> createFolder() {
    FolderImpl<T> folder = new FolderImpl<T>();
    return folder;
}

The new template does not seem to generate the same !