Serps don’t index 4XX pages since they don’t work. Because of this, they’ll disregard any canonical tags pointing to these pages and sometimes end up indexing the incorrect (non-canonical) version with the website page. This option is particularly useful for advertising and marketing buys. The text and placement of your warn https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html