If you use Next.js anywhere but Vercel, here's some bad news: Next.js 15.1+ is broken.tl;dr: Starting with version 15.1.8, Next.js might break metadata handling for non-Vercel deployments, potentially devastating your search rankings. This is not a bug.When Did This Happen?In 2024, Vercel introduced metadata streaming as an experimental feature. This fundamentally changes how Next.js handles metadata.Traditional approach: Metadata tags (title, description, Open Graph tags) are rendered directly ...