Hi guys,
After investigating the issues -
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We will fix the schema errors (for the author image).
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Regarding the “image too small” warnings for the amp - these are just warnings, and we are not sure they have any effect ( I.e. If Google decides to display rich snippet of the post, e.g. top carousel, then the image quality may not be the best). Google has a very specific size requirements, we might adjust a bit in the future.