Affected version
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After an ISR revalidation turns a route that was prerendered as a fully static redirect() into a partially prerendered page, client-side navigations fail: RSC requests receive the static shell only (or 404), never resume, causing React error 412 and a full page reload. The build-time prefetchDataRoute pins the route to serve prebuilt static RSC content, ignoring the new postponed cache entry.
When after() is called with a promise that never settles, the bookkeeping .then() callback registers in the caller's async context, pinning the entire request-scoped context (including RSC payloads) for the lifetime of the server process, leading to unbounded memory growth.
Next.js cacheComponents bfcache ordering causes React to reorder DOM siblings, re-parenting iframe subtrees and reloading them from the second visit onward.
In Next.js 16.x, the image optimizer's fetchExternalImage rethrows raw fetch errors, causing a 500 Internal Server Error for upstream DNS failures, connection refusals, and TLS handshake errors. The expected behavior is a client-visible upstream error status (502), consistent with other upstream failure handling in the optimizer.