I am developing my site with Symfony 7.1. Following the instructions on: https://symfony.com/bundles/ux-chartjs/current/index.html. I did the following:

1. Installed symfony/ux-chartjs. My composer.json has this line.
2. In my controller I copy the code shown in the official doc.

#[Route('/books/status', name: 'book_status')]
    public function status(ChartBuilderInterface $chartBuilder): Response
    {
        $chart=$chartBuilder->createChart(Chart::TYPE_LINE);
        $chart->setData([
            'labels' => ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
            'datasets' => [
                [
                    'label' => 'My First dataset',
                    'backgroundColor' => 'rgb(255, 99, 132)',
                    'borderColor' => 'rgb(255, 99, 132)',
                    'data' => [0, 10, 5, 2, 20, 30, 45],
                ],
            ],
        ]);

        $chart->setOptions([
            'scales' => [
                'y' => [
                    'suggestedMin' => 0,
                    'suggestedMax' => 100,
                ],
            ],
        ]);

        return $this->render('admin/dashboard.html.twig', [
            'chart'=>$chart,
        ]);
    }

3. And finally, in my twig template:

<script src="/assets/js/chart.js"></script>
<div>
    {{ render_chart(chart)}}
</div>

(I have omitted a lot of CSS related codes and template inclusion)

In the browser, I can see that the “canvas” element is inserted by twig:

<canvas data-controller="symfony--ux-chartjs--chart" data-symfony--ux-chartjs--chart-view-value="{"type":"line","data":{"labels":["January","February","March","April","May","June","July"],"datasets":[{"label":"My First dataset","backgroundColor":"rgb(255, 99, 132)","borderColor":"rgb(255, 99, 132)","data":[0,10,5,2,20,30,45]}]},"options":{"scales":{"y":{"suggestedMin":0,"suggestedMax":100}}}}"></canvas>

But the chart is not displaying, nothing at all. Am I missing something?