Featured images showing no "alt text"

Hi there,
I’ve noticed that the last show blog posts that I’ve posted are missing the “alt text” on the featured image. When I go to use the app Tailwind to pin the images to Pinterest, it only shows “…” where the alt description should have been. I have the images hidden on single posts, but that shouldn’t be affecting the alt text existing.

Hello,

Can you please provide a link to an affected page?

Kind Regards, Roman.