Query string is taken off only when required, pagination is retained and managed (an current "prev/future" system is needed, more recent PS presently will it) Canonical URLs are applied to stay away from copy information and to indicate to engines like google that's the “first” webpage. It is simply an https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html