Featured images missing

Hello,
Not sure what is happening but on some amp posts the featured image shows, on some not.
Here is doesn’t show, https://www.artbykarie-ann.co.uk/blog/terrier-pet-portrait/ on this post https://www.artbykarie-ann.co.uk/blog/bespoke-pet-portraits/ it does when I view them by adding the amp to the end of the address.
All of my plugins are up to date. No errors showing for amp in google search console. Any ideas please?
Thanks, Karie.