Search engines like google don’t index 4XX pages simply because they don’t function. Consequently, they’ll disregard any canonical tags pointing to these pages and sometimes end up indexing the wrong (non-canonical) version in the web page. How to fix: This one particular is rather simple—just be sure you increase hreflang tags https://bookmarkcitizen.com/story18825226/was-ist-canonical-tag-an-overview