redirects in next config different from version before and produce endless redirect loops

[philipheinser]

Link to the code that reproduces this issue

https://codesandbox.io/p/sandbox/cocky-frost-dsd496

To Reproduce

1. add this to config
   async redirects() { return [ { source: '/app', destination: '/app/', permanent: false, }, ] }

2. open /app and see your browser freeze or stop at some point do to endless redirects.

Current vs. Expected behavior

Above example should redirect normally from /app to /app/, bur redirect loop happens instead

Redirect loop happens in redirect in new Version > 13.4.19. without our code changes from previous versions

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.4.0: Fri Mar 15 00:12:49 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6020
  Available memory (MB): 32768
  Available CPU cores: 12
Binaries:
  Node: 21.7.3
  npm: 10.5.0
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  next: 14.2.2 // Latest available version is detected (14.2.2).
  eslint-config-next: 14.2.2
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.4.5
Next.js Config:
  output: N/A

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

Runtime

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

next dev (local), next build (local), next start (local), Vercel (Deployed), Other (Deployed)

Additional context

I tested with the latest canary and still happens

[kyle-haining]

By default, Next.js redirects a url with a trailing slash to one without it:
https://nextjs.org/docs/app/api-reference/next-config-js/trailingSlash

You probably want to turn this option off.