Every way a head goes wrong
A title declared twice and wrapped over three lines, a description of ten thousand characters, an empty URL, an image that is not a URL, an image that is a data URL, fifteen tags where ten are kept, a hundred and twenty related links, an uppercase property name and two tags missing half of what a tag needs.
What should come back is a truncated, deduplicated, cleaned-up set of properties, and no error anywhere.