custom field "Image advanced" has param "image_size" with default value "thumbnail". If a set this to "medium" (default WP settings - on my server is for example 530x1000), than WP shows only rectangle 284x284px with crop similar to thumbnail mode..
The "image_size" param is there to make sure the images are not blurry. It's not meant to display images with exact width and height. Actually, the style for images mimics the Media Library, that's why you see it 284x284 square.
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