next.js: Next fails to build on Windows with a favicon.ico in the app/ folder (HookWebpackError: File C:\Users\xxx\Projects\next-favicon-reproduction\.next\server\app\favicon.ico\route.js does not exist.)

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 10 Pro
Binaries:
  Node: 18.16.0
  npm: N/A
  Yarn: N/A
  pnpm: 8.3.1
Relevant packages:
  next: 13.3.1-canary.16
  eslint-config-next: N/A
  react: 18.2.0
  react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

App directory (appDir: true), Metadata (metadata, generateMetadata, next/head, head.js), Operating System (Windows, MacOS, Linux)

Link to the code that reproduces this issue

https://github.com/r3Fuze/next-favicon-reproduction

To Reproduce

• Use Windows
• Add a favicon.ico to the app/ folder. (I used one from create-next-app)
• Run pnpm build
• Build fails

Describe the Bug

This happens on Windows, but not when I tried to reproduce it on codesandbox.io.

It became a problem starting with 13.3.1-canary.6 and is still broken in 13.3.1-canary.16 Builds without problems on 13.3.1-canary.5

Full error:

warn  - You have enabled experimental feature (appDir) in next.config.js.
warn  - Experimental features are not covered by semver, and may cause unexpected or broken application behavior. Use at your own risk.
info  - Thank you for testing `appDir` please leave your feedback at https://nextjs.link/app-feedback

Failed to compile.

HookWebpackError: File C:\Users\xxx\Projects\next-favicon-reproduction\.next\server\app\favicon.ico\route.js does not exist.
    at makeWebpackError (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\webpack\bundle5.js:28:308185)
    at C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\webpack\bundle5.js:28:105236
    at eval (eval at create (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\webpack\bundle5.js:13:28771), <anonymous>:57:1)
    at C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\webpack\bundle5.js:28:68649
    at C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\build\webpack\plugins\next-trace-entrypoints-plugin.js:420:143
-- inner error --
Error: File C:\Users\xxx\Projects\next-favicon-reproduction\.next\server\app\favicon.ico\route.js does not exist.
    at Job.emitDependency (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\@vercel\nft\index.js:1:39473)
    at async Promise.all (index 3)
    at async nodeFileTrace (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\@vercel\nft\index.js:1:35430)
    at async C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\build\webpack\plugins\next-trace-entrypoints-plugin.js:141:28
    at async Span.traceAsyncFn (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\trace\trace.js:97:20)
    at async TraceEntryPointsPlugin.createTraceAssets (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\build\webpack\plugins\next-trace-entrypoints-plugin.js:95:9)
caused by plugins in Compilation.hooks.processAssets
Error: File C:\Users\xxx\Projects\next-favicon-reproduction\.next\server\app\favicon.ico\route.js does not exist.
    at Job.emitDependency (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\@vercel\nft\index.js:1:39473)
    at async Promise.all (index 3)
    at async nodeFileTrace (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\compiled\@vercel\nft\index.js:1:35430)
    at async C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\build\webpack\plugins\next-trace-entrypoints-plugin.js:141:28
    at async Span.traceAsyncFn (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\trace\trace.js:97:20)
    at async TraceEntryPointsPlugin.createTraceAssets (C:\Users\xxx\Projects\next-favicon-reproduction\node_modules\.pnpm\next@13.3.1-canary.16_react-dom@18.2.0_react@18.2.0\node_modules\next\dist\build\webpack\plugins\next-trace-entrypoints-plugin.js:95:9)


> Build failed because of webpack errors
info  - Creating an optimized production build . ELIFECYCLE  Command failed with exit code 1.```

### Expected Behavior

Next builds without errors

### Which browser are you using? (if relevant)

_No response_

### How are you deploying your application? (if relevant)

_No response_