Youtube video doesn’t show up

YouTube videos disappeared from my pages built with blocks. I still see them in the editor, but not in published pages/posts. However I can see YouTube video on a page built with Elementor.
I tried to switch off all my plugins, different formats of YouTube links (https://www.youtube.com/watch?v=cKpwKSa-UFc and https://youtu.be/cKpwKSa-UFc), tried your code:
.wp-embed-responsive .wp-embed-aspect-16-9 .wp-block-embed__wrapper:before {
padding-top: 56.25%;
}
Nothing helped.
Would grateful for advice.

The page I need help with: [log in to see the link]