Issues

• Turbopack dev: next/dynamic in Pages Router _app preloads a 404 chunk (regression in 16.5.0-canary.8)

  Lazy LoadingPages RouterTurbopack
  vercel/next.js#100073 · Filter by author dcheng1290 opened on Oct 12, 2026

• Turbopack: next build spawns one webpack-loader process pool per loader chain × context since 16.4.0-canary.39 (hundreds of Node.js processes, OOM)

  PerformanceTurbopack
  vercel/next.js#100064 · Filter by author dlehmhus opened on Oct 12, 2026
  1

  

• Prefetch loop: optimistic routing drops a parallel slot's catch-all param next to a static segment

  Linking and NavigatingParallel & Intercepting Routes
  vercel/next.js#100055 · Filter by author pablodecm opened on Oct 12, 2026

• Turbopack: webpackChunkName ignored when migrating from webpack

  Lazy LoadingOutputTurbopack
  vercel/next.js#100051 · Filter by author karlhorky opened on Oct 12, 2026

• Turbopack dev server deadlocks deferred route compilation after a proxy request (16.4.0)

  InstrumentationLazy LoadingMiddlewareRuntimeTurbopack
  Bug

  vercel/next.js#100022 · Filter by author Naaikho opened on Oct 12, 2026
  1

• next/dynamic script preloads lack crossOrigin, so Turbopack can't reuse them since #92070 — ~1s delay per chunk with a cross-site assetPrefix

  Lazy LoadingPerformanceTurbopack
  Bug

  vercel/next.js#100014 · Filter by author yu1222 opened on Oct 12, 2026

• Truncated HTML on first load leaves App Router page unhydrated with an unhandled 'Connection closed.' (React #412) rejection

  Error HandlingRuntime
  vercel/next.js#100007 · Filter by author paurushrai opened on Oct 12, 2026

• Turbopack: chunk loader scans the whole DOM with querySelectorAll for every chunk (O(DOM × chunks) main-thread cost at boot)

  PerformanceTurbopack
  vercel/next.js#99993 · Filter by author ylcn91 opened on Oct 11, 2026
  1

• Segment cache: unbounded re-prefetch loop (thousands of _rsc requests per minute) for <Link>s whose dynamic segment holds a raw : (not percent-encoded), with optimistic routing

  Dynamic RoutesLinking and NavigatingPerformance
  vercel/next.js#99988 · Filter by author chrisgeo opened on Oct 11, 2026
  1

• next dev retains heap on every App Router render (16.4.0): linear growth that survives forced GC

  Performance
  vercel/next.js#99983 · Filter by author vlegacy opened on Oct 10, 2026
  1

• next analyze export fails with ENOENT on an icon route that uses generateImageMetadata

  MetadataTurbopack
  vercel/next.js#99970 · Filter by author Wizzlesky124 opened on Oct 10, 2026

• Turbopack keeps unused exports of a namespace reached through another namespace (lib.core.X)

  PerformanceTurbopack
  vercel/next.js#99954 · Filter by author colinhacks opened on Oct 9, 2026

• Unused imports in generated .next/dev/types/validator.ts fail type-check with noUnusedLocals for metadata-only apps (since 16.4.0)

  TypeScript
  vercel/next.js#99919 · Filter by author lyonzin opened on Oct 9, 2026

• Server action that calls notFound() without JavaScript renders the not-found page without the root layout

  Not FoundServer Actions
  vercel/next.js#99913 · Filter by author HardMax71 opened on Oct 9, 2026

• Vercel: launcher crashes with Cannot find module './.next/server/pages/_next/image.js' when an image optimizer local source returns 5xx

  Image (next/image)Runtime
  Bug

  vercel/next.js#99911 · Filter by author arjenblokzijl opened on Oct 9, 2026
  2

• useServerInsertedHTML output is duplicated in prerendered HTML with cacheComponents

  CSS
  vercel/next.js#99905 · Filter by author dgattey opened on Oct 8, 2026

• Entries regenerated after revalidateTag(tag, profile) are expired again when the profile's expire window ends

  vercel/next.js#99903 · Filter by author awss1i opened on Oct 8, 2026
  1

• Turbopack removes an IIFE in production builds when its inner callee is annotated /* @__PURE__ */

  SWCTurbopack
  Bug

  vercel/next.js#99897 · Filter by author oenstrom opened on Oct 8, 2026

• @next/routing doesn't match dynamic API routes when i18n is configured

  Dynamic Routes
  Bug

  vercel/next.js#99895 · Filter by author oskari opened on Oct 8, 2026

• Turbopack builds fail for edge route handlers when cacheHandlers is set

  Turbopack
  Bug

  vercel/next.js#99894 · Filter by author oskari opened on Oct 8, 2026

• A stale "use cache" hit replaces its own entry in the Resume Data Cache with the background revalidation, so dev reports uncached data and the runtime prefetch loses the entry

  Bug

  vercel/next.js#99884 · Filter by author giovannetti-eric opened on Oct 8, 2026

• cacheComponents: page past its expire returns 500 because unstable_cache skips the resume data cache (NEXT_STATIC_GEN_BAILOUT)

  vercel/next.js#99866 · Filter by author tdejager opened on Oct 8, 2026

• revalidateTag(tag, 'max') cancels an earlier revalidateTag(tag, { expire: 0 }) on the same tag

  vercel/next.js#99862 · Filter by author kuuak opened on Oct 8, 2026

• cacheComponents: client navigation to a generateStaticParams path crashes with React #412 when a custom cacheHandler misses (fallback shell served as static RSC)

  Dynamic RoutesLinking and Navigating
  vercel/next.js#99861 · Filter by author tdejager opened on Oct 8, 2026
  1

• turbopackModuleFragments: build panics with "ModuleId not found for ident ... [app-client] (ecmascript) <internal part 0>" when a function from a "use client" module is passed as a prop

  Turbopack
  Bug

  vercel/next.js#99856 · Filter by author stefanprobst opened on Oct 8, 2026