LT extension for Chrome/Edge doesn't work on my web site

Hello!
The LT extension doesn’t work in Chrome browser (last version) on my site.
I am checking the annotations of speakers’ talks on my educational website.
But the icon of LT doesn’t appear in the edited fields. I have verified all setting and didn’t find any who can block the LT.
How can it be fixed? Please see the attachment.
Also, I tried to do the same in MS Edge. The same situation, it doesn’t work.
I tested it on the webpage https://it-conf.ru/ru/reviewTalk/95591 in the edit mode.

Hi Vladislav, could you check the HTML to see if there’s a spellcheck="false" attribute? That might turn off LanguageTool. Unfortunately, I cannot reproduce the problem as I cannot sign up on the site for some reason.