H5P not loading in WP 5.8

Hi,

I recently updated WP and got the 5.8 version. Everything worked well before but now the shortcode don't load on the frontend. On the backend, I can create and edit them but on the frontend, the iframe is empty.

Here's a test page : https://ohmyfrench.com/a0/

You can check this test page where there are two H5P shortcodes. You can see that the shortcodes load but the iframes are empty. Has this happened before and how to troubleshoot the problem?

I deactivated my caching plugin in case but it doesn't change anything. I'd appreciate any help.

Thanks,

Jordan.