Set Featured Image – suddenly stopped working

Hi, I am using the Magazino theme and for years I have always set a featured image to display for each new post . Suddenly this has just stopped working. I set the image and all seems to be fine but when I go and look at the post on the homepage it is not displaying the featured image. (all previous posts are still displaying their featured image, it’s just the new posts that are not)

I have not changed anything at all, one day it was working and the next day it was not.

Please help!