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Next.js 16 static export: RSC payload path mismatch causes 404 errors on prefetch
In Next.js 16.0.0–16.3.5 with `output: 'export'`, the generated RSC payload files use a directory-based path (`__next/page/__PAGE__.txt`), but the browser requests a flat dotted filename (`__next.page.__PAGE__.txt`), leading to 404 errors during link prefetching on statically exported sites.