beta version (5.1.1130.26)

[Cyanide]

For example, a page https://market.yandex.ru/catalog--med-i-...?hid=91345 looks like this on engine 102 https://i.imgur.com/980oDAH.png and so on 118 https://i.imgur.com/Kbjp6MB.png 
if you don't see problems, it doesn't mean they don't exist

PS https://webextension.org/listing/gmail-notifier.html and about extensions, this does not work on old engines, but what does work (previous versions) their functions no longer work mark as read

You're kinda ignoring what I'm saying. I don't deny there are problems, but I don't think it's necessary to focus on Yandex and other "trend watchers". For example, the Checker Plus for Gmail extension works fine on version 102, with all its features. Why don't you contact Yandex and tell them to stop using those solutions that don't work on older browsers? If tomorrow, they introduce some new features into their Yandex Browser and rewrite all their services to focus on it, will you require Chrome developers to adapt for these changes?