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Actually, there was another issue, also related to slash "/" non slash "/" issue.Each page of my website had a hreflang tag with URL with the "/" as the end.But a lot of my URL, including the most ranked ones, doesn't have "/" at the end of the slug. But anyway, URL with "/" are automatically redirected 301 to non slash URL (in case, the good URL has no /)Was it a big issue ?The hreflang tool from google showed a lot of errors because of that (now it is OK) but my website has not yet recovered.Thanks hreflang.jpg