Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/peaceful-star-h8sts7?workspaceId=ws_Veu8GohFbxb5ytXVyufE71

To Reproduce

1. Open the Code Sandbox link
2. Run "yarn eslint reproduction-app". Observe zero exit code
3. Run "yarn next build". Observe failure, showing eslint errors that are in the "eslint-suppressions.json" file

Current vs. Expected behavior

Current behaviour: "next build" seems to ignore the "eslint-suppressions.json" file used by eslint

Expected behaviour: "next build" should account for eslint errors in the "eslint-suppressions.json" file in the same way eslint does

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun Aug  6 20:05:33 UTC 2023
  Available memory (MB): 4102
  Available CPU cores: 2
Binaries:
  Node: 20.9.0
  npm: 9.8.1
  Yarn: 1.22.19
  pnpm: 8.10.2
Relevant Packages:
  next: 15.4.2-canary.29 // Latest available version is detected (15.4.2-canary.29).
  eslint-config-next: 15.4.5
  react: 19.1.1
  react-dom: 19.1.1
  typescript: 5.8.3
Next.js Config:
  output: N/A
Done in 1.88s.

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

Not sure

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

next build (local)

Additional context

No response