Sorry for one more issue: there is no possibility to answer in previous issue, but problem is interesting by its own. You quotes one statement from checklist, I quote another. But I don't think that our image comletely matches statement "if the image is “featured-img”, “cover”, “lead_img”, “main_image”, etc." In our case image has class "thumbnail" and thumbnail is something smaller than cover...
But generally it's funny that here we have one more couple of checklist's statements that goes against each other