Error processing favicon in Next.js 15

[AvishakeAdhikary]

Link to the code that reproduces this issue

https://github.com/AvishakeAdhikary/blog

To Reproduce

1. Upgrade to Next.js 15.0.1.
2. Run npm run dev in the project directory.
3. Observe the error regarding the favicon processing.

Current vs. Expected behavior

• Current Behavior:
  When running the development server, the following error occurs:

  ⨯ ./app/favicon.ico
  Processing image failed
  unable to decode image data
  
  Caused by:
  - Format error decoding Ico: The PNG is not in RGBA format!
  

• Expected Behavior:
  The favicon should load without errors, allowing the application to start correctly.

Provide environment information

Operating System:
  Platform: Windows
  Arch: x64
  Version: Windows 11

Binaries:
  Node: v20.13.1
  npm: 10.9.0

Relevant Packages:
  next: 15.0.1
  eslint-config-next: 15.0.1
  react: 19.0.0-rc-69d4b800-20241021
  react-dom: 19.0.0-rc-69d4b800-20241021
  typescript: ^5

Next.js Config:
{
    images: {
      domains: ['raw.githubusercontent.com'],
    },
}

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

• This issue occurs locally during development.
• The favicon is expected to be in PNG format, but it seems to be causing format errors.
• I have attempted to clear the browser cache, but the issue persists.