next.js

c986bccc - fix: preserve cache behavior for PPR fallback shells with root params (#88556)

fix: preserve cache behavior for PPR fallback shells with root params (#88556) When generating PPR fallback shells, a cache miss during warmup was being treated as a dynamic hole, so the warmup render never filled new cache entries. This caused root‑param fallback shells (e.g. `/en/blog/[slug]`) to suspend even though root params were already known. This change always creates a fresh prerender RDC for warmup and copies any seed hits into it. The final render then uses the warmed cache, so fallback shells can reuse populated entries without short‑circuiting. On the export side, we now choose a seed RDC by matching known params (e.g. locale) so /en/... fallback shells don’t get seeded with /fr/... data. (Previously, the RDC seed was "last-write-wins". Fixes NAR-716