The hreflang “x-default” attribute price alerts to Google algorithms that the web page doesn’t goal any unique language or locale and it is the default site when no other page is better suited. As outlined earlier mentioned, the hreflang and canonical tags have slight variances in their use and application. https://addons.prestashop.com/es/seo-posicionamiento-buscadores/30904-etiquetas-automaticas-hreflang-canonical-etiquetas-seo.html