When attaching a link using the share_fetch.url method, the thumbnail of the photo from the site is not inserted?

Question

Classmates

If you attach a link from another site in Odnoklassniki when creating a new topic, then a thumbnail picture from the page via the link will be automatically loaded. If you make a post through the API, and first load the link through the share_fetch.url method, then the photo thumbnail from the site is not loaded, but just a gray image placeholder. Tried other share_fetch too.