nextjs - 💡(How to fix) Fix Turbopack dev mode: pages fail to hydrate in 16.2.4 (works in 16.1.3 and production build) [1 comments, 2 participants]

Link to the code that reproduces this issue

Private repo — details below reproduce the issue on any App Router project with middleware rewrites.

To Reproduce

1. Upgrade from [email protected] to [email protected]
2. Run next dev (Turbopack)
3. Navigate to a page that goes through middleware rewrite (e.g. subdomain → /t/[tenant]/...)

Current vs. Expected behavior

Expected: Page renders and hydrates normally (as it does in 16.1.3 and in next build && next start with 16.2.4).

Current (16.2.4 dev only):

• Initial load: TypeError: Cannot read properties of undefined (reading 'payload') in core.js:297
• After clearing .next cache: page server-renders correctly but React never hydrates — buttons are not clickable, client components stay in loading state, no interactivity
• HMR connects fine, no errors in console after cache clear

Key observations

• next build && next start with 16.2.4 works perfectly — regression is Turbopack dev mode only
• Rolling back to [email protected] with pnpm install --frozen-lockfile immediately fixes it
• The corrupted .next Turbopack cache grew to 3.8 GB before we cleared it
• React also upgraded from 19.2.3 → 19.2.5 in the same lockfile resolution, but production mode works fine with both

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin 25.3.0

Binaries:
  Node: 22.x
  pnpm: 10.x

Relevant Packages:
  next: 16.2.4 (broken) / 16.1.3 (works)
  react: 19.2.5
  react-dom: 19.2.5

Next.js Config:
  output: standalone

Which area(s) are affected?

Turbopack, App Router, Middleware/Proxy

Which stage(s) are affected?

next dev (Turbopack)

Additional context

We use a proxy.ts (Next.js 16 proxy, replaces middleware.ts) that rewrites subdomain requests to tenant-prefixed paths (e.g. shop-xinfer.example.com/chat → /t/570666/chat). This rewrite flow works correctly in 16.1.3 dev and in 16.2.4 production — only 16.2.4 Turbopack dev mode fails to hydrate.