When I search Google images, I always get "correct" images with jpg, png, and folder extensions.
I've never seen images with strange URLs...
Then, obviously, if I search for images from a specific site using site:mysite.it, it's normal for something to come up, but still very little.
Google indexes images based on various values, but especially based on the extension.
For example, for a few years now, it has been rewarding the webp images you've implemented, but if the images uploaded to the forum are converted to webp, they become
Instead of
Won't the image become something else?