I would say they have other suggests to detect if the knowledge you present through JSON-LD is relevant for their online search engine (like checking your web site is in fact talking about what it claims to speak about). Astonishingly the Rich snippet requirements seems to have changed from april https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html