Thanks for first reply. Not sure did I write bad english, but it’s not webp issue. We serve both versions of images and ~90% of our images is shown correctly. Just some of them is corrupted/broken and we have no clue why. CSS/JS or something spesific with iOS.
Easiest is to go our site with any of browsers with iphone and see how some images from articles example is served correctly and some logos or featured images not. Very very confusing issue!