hreflang in Next.js 16: 3 mistakes that quietly delete your translated pages from Google

TL;DR — If you ship the same page in several languages, hreflang is what tells Google "these are translations of each other, not duplicates." Three mistakes make Google ignore (or actively penalize) your setup: a non-reciprocal cluster, hreflang pointing at URLs that 404, and a canonical that points

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