Thanks,
Apparently you have something else also trying to rewrite the cdn domain, because when I visit https://edieta.org/en/soft/whatsapp-has-added-a-new-useful-feature?nocache
which bypasses FVM, the images that are affected, are already rewritten to the CDN.
Either your images are already saved on the database with the cdn url, or some other plugin is rewriting the urls and conflicting with FVM.
In the future I’ll add fix to skip the images that are already on the cdn and to prevent the double https:// thing, but for now…
If you don’t want FVM to interfere with the images and let the other plugin take care of it (or just don’t want to touch the cdn urls saved on the database), you can replace the integration field on the plugin settings to keep it empty, or fine tune them by replacing the rules to only rewrite images on your domain, and leave the ones already on the cdn alone.
# replace the cdn integration with this one
img[src*=dieta.org], img[data-src*=dieta.org], img[data-srcset*=dieta.org]
picture source[srcset*=dieta.org]
a[data-interchange*=dieta.org]
And then purge your page cache.
Should work.