There are still some inconsistencies. Like the image Page is type .png, but the URL says .webp. But considering this was the very first run, that's pretty good!
I hadn't tested the code of my SSG until now, but it works
I sent in an MDX file which contains frontmatter and an image. From the result, you can see it loaded the frontmatter into the page data object, turned it into HTML, extracted the image as another page and converted it to WEBP
Volpeon