Rich Preview not loading for Twenty Twenty-One theme

Hi. I pasted the links of my posts that have a featured image but no images in the post itself. Even in some posts, images are there and yet the rich preview of the featured image is not available in rich preview.

I can share AnyDesk if you want to investigate on my end. Please look into this.

Thank you.

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