In the post I have images such as

https://www.ziaruldeiasi.ro/app/gethumb.details.php?id=479598&w=800&h=600

These display fine, and Jetpack seems to leave them as they are when visiting the posts. However, the thumbnail created on index pages (home, tags, searches) goes through Jetpack CDN image processing, and the SRC becomes

https://i2.wp.com/www.ziaruldeiasi.ro/app/gethumb.details.php?resize=800,450

These are broken images and lead to browser console errors (404 obviously).

Is there a way to instruct Jetpack to leave images alone based on their source? Or any fix to this issue?

Thank you.