Changing filenames with webp: does it impact images SEO?

[webtek-dev]

I have a website where images are very important and we get a lot of traffic from google images. When enabling webp images, Mod Pagespeed will constantly change the filenames of the images. Does that means it will have a negative impact on SEO?

If googlebot finds a webp image on my website and adds it to google images, and then some day the file name changes. I assume the ranking will be lost because google will think the image was deleted?

If images SEO is very important, should we completely disable webp rewriting?

[Lofesa]

Pagespeed serve rewrited images whit a link rel canonical header, so if google do their work, these images don't be indexed but the canonical.
Anyway, images url don't change unles the image change.
One jpg image, depending on enabled filters, generate some pagespeed rewirted urls (if the images get resized or converte to webp...) but unless the image changes, thats urls become allways the same.