Img alt attribute missing in PageSpeed Insights

Hi, PageSpeed Insights showing that the “alt” attribute is missing, but I can see it DevTools inspect, see screenshot. That’s the PageSpeed Insights bug or the issue can be somewhere else?

Screenshot: https://ibb.co/NYLLDby

HTML/PHP:
<img
alt="'. $hero_image_alt .'"
src="'. $hero_img_url_530w[0] .'"
layout="intrinsic"
width="530"
height="530"
srcset="
'. $hero_img_url_375w[0] .' 3x,
'. $hero_img_url_768w[0] .' 3.5x,
'. $hero_img_url_990w[0] .' 2x,
'. $hero_img_url_1470w[0] .'"
disable-inline-width data-hero />

The page I need help with: [log in to see the link]