Auto.ru
It seems that there are more successful responses, but there are still thumbnails where this version doesn't work. And the thumbnails are different every time - after refreshing the page, those that worked may stop working, and vice versa - those that did not work suddenly start to increase. It seems that there are some problems with the code on the site. If it can not be fixed completely - it is better to leave this latest version. The sieve works well in search results.
https://auto.ru/cars/used/sale/packard/caribbean/1126513251-32c83438/


MegaMarket - gray spinner
FF | Chrome
https://i.imgur.com/IDrxbjK.png
https://i.imgur.com/keWjDWW.png
https://megamarket.ru/catalog/kleenki-na-stol/#?related_search=клеенки+на+стол


Kuper
This version shows the first photo from the product gallery when hovering over the thumbnail. It tries to show the whole gallery (the album counter in the upper left corner), but nothing happens. If you hover over the entire product card or the title - either no reaction or a yellow spinner:
https://streamff.com/v/9f6a6afd
https://kuper.ru/multisearch?q=кофе&sid=107


PS
I tested with [MediaGrabber] turned off, logging into my account in the store (Kuper) doesn't help.