In some cases, Google might think that rich snippets give no benefit towards the search user, Therefore favoring other SERP features like Showcased Snippets or basic blue one-way links. The structured knowledge testing Device will not yet Show the extra line of text with references to actors/administrators, even so if https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html