Translation of a website with a .notranslate class on the HTML element

I’ve noticed some strange behavior:

The site adds a .notranslate class to the HTML element. When I translate the site, I do not see the translated text — that part works as expected. When i select some text the translation button to not appear, and this expected behavior, because the page in translated state.

But like a user who did not know about .notranslate selector i think the extention not work. I translated the page but didn’t see any translation. Then I selected the text, but the translate button didn’t appear either.