Lead images parent div has the class "foto_relacionada" on this site, it should be set to cover.
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.
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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.