Thank you, but the issue is only with the images that we are implementing using polish. Even in developer tools those images are showing as JPG, whereas the images coming via Cloudflare where we haven’t used resize (just polish) are coming down as WebP correctly.
i.e its only when we resize that Cloudflare doesn’t seem to be pushing them as Webp.
I think Lightouse by the code at GitHub still searches for <img> tag and it’s src value? I might be wrong and it’s “byte comparasion audit” of how much could be saved, if so.
Despite of this, even if you add a WEBP image as a value of the src attribute, it might still find some possible savings and recommend this so far (if not used some drastic optimization and reduction of the data from it - lossy vs losless compression?).
I’m not a developer, though I dirt my fingers by tinkering here and there… but when running the F12 > Lighthouse audit for the OP site, it only suggests NexGen for images that were resized (and are not yet using WebP) and one image kept by Polish as JPG, as the conversion was deemed “not needed”.