Hello @alessandro.scandone @francesco.mastellone, I checked that the image format is SVG, and it's an expected behavior for SVGs images not coming through imgix CDN and not a bug.
We removed SVGs from the imgix CDN due to security vulnerabilities, and they were moved to the amazon server and were treated as files, not images. They are the only image format served like this. Originally on the Amazon server, they weren't run through the CDN.
Please go through the following blog to learn how Prismic handles SVGs: Changes to how we handle SVG's - Prismic
So there are some domains:
All images, except for SVG's , should be coming from images.prismic.io
SVG's should be coming from <repo-name>. cdn.prismic.io/ <repo-name>
(if they are coming from prismic-io.s3.amazonaws.com/, then try to remove and re-add them to deliver them from<repo-name>. cdn.prismic.io/ and see if it works.)
Give this a try, and let me know.
Thanks,
Racheal.