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https://instantview.telegram.org/checklist#6-2-2-cover-images: "It is obligatory to use a cover image:
If the image is present on the page and described in the source as “featured-img”, “cover”, “lead_img”, “main_image”, etc."
In this case the image has the class "wp-post-image". Ordinary images don't have such a class (see, for example, https://368.media/2016/01/19/professor-iz-odessy-pridumavshij-tselebnuyu-maz-shantazhiroval-aspiranta/).