The tag will not cover genuine replicate material that you might have on your website, such as identical product or service descriptions for different products. Google will only browse by your hreflang tag that information “a” is really a translation of content “b.” This can support in reducing bounce fees https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/30904-automatyczne-tagi-hreflang-i-tagi-kanoniczne-seo.html