The record doesn't have a valid data snapshot in 3.2.2

I have the "The record doesn't have a valid data snapshot" message when I try to access hasChanged method when I update a model.

here is my controller (somme line are deleted)

In the code below, the hasChanged works only because I added $serie->setSnapshotData($originalData); but it should not be mandatory to add this manually.

        $serie = $seriesService->getSeriesBySlug($slug);
        $originalData = $serie->toArray();
        $form = new SeriesForm();
        $form->setEntity($serie);
        try {
            if ($this->request->isPost()) {
               //...
                } else {
                    $form->bind($this->request->getPost(), $serie);
                    $seriesService = $this->di->get('SeriesService');
                    $serie->setSnapshotData($originalData);
                    $seriesService->saveSeries($serie);
                    //redirect to addChapter page for this series.
                    $this->response->redirect('admin/series/');
                }
            } else {
                //GET

            }
        }
    ...

Am I doing something wrong ?

Phalcon verison : 3.2.2