Describe the bug

When building and previewing a Next.js app with next@canary (16.2.0-canary.53+) using @opennextjs/cloudflare, all dynamic
routes return 500 Internal Server Error at runtime. The error is thrown by the CF Workers runtime:

Error: Unexpected loadManifest(/.next/server/subresource-integrity-manifest.json) call!
Error: Unexpected loadManifest(/.next/server/app/api/[route]/react-loadable-manifest.json) call!

These manifest files were introduced in Next.js 16.2.0-canary and are not yet handled by @opennextjs/cloudflare, causing
the worker to crash on any request that triggers loadManifests().

Environment

• @opennextjs/cloudflare: 1.16.5
• next: 16.2.0-canary.53
• wrangler: 4.67.0

Steps to reproduce

1. Create a Next.js app router project:
   pnpm create next-app my-app --app
   cd my-app
2. Add @opennextjs/cloudflare and upgrade Next.js to canary:
   pnpm add @opennextjs/cloudflare
   pnpm add next@canary
3. Create an open-next.config.ts and wrangler.jsonc as per the OpenNext Cloudflare docs.
4. Build and preview:
   pnpm opennextjs-cloudflare build
   pnpm opennextjs-cloudflare preview
5. Navigate to any dynamic/SSR route — you'll receive a 500 with the following in wrangler logs:
   ✘ [ERROR] ⨯ Error: Unexpected loadManifest(/.next/server/subresource-integrity-manifest.json) call!

Expected behavior

Dynamic routes should render successfully. The new manifest files introduced in the canary
(subresource-integrity-manifest.json, per-route react-loadable-manifest.json) should either be bundled into the worker or
gracefully handled when not present.

@opennextjs/cloudflare version

1.16.5

Wrangler version

4.67.0

next info output

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 20.19.2
  npm: 10.8.2
  Yarn: 1.22.22
  pnpm: 9.15.9
Relevant Packages:
  next: 16.2.0-canary.58 // Latest available version is detected (16.2.0-canary.58).
  eslint-config-next: N/A
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.9.3
Next.js Config:
  output: N/A

Additional context

No response