Error when building url() under Dynamic Routes using Turbopack and Scss.

[mugi-uno]

Link to the code that reproduces this issue

https://github.com/mugi-uno/next-15-turbo-and-lightningcss-sandbox

To Reproduce

Steps to Reproduce:

1. Start the application in development mode with the --turbo option.
2. Open the corresponding Dynamic Routes page. ( e.g. /foo )

Result:

• The error occurs: Module not found: Can't resolve xxx

Current vs. Expected behavior

Expected Behavior

Even when using Turbopack, Scss files should be built without any issues.

Current Behavior

Turbopack fails to build Scss in the following situation:

• The build target is an Scss file.
• The Scss file uses url() to reference resources under Dynamic Routes.

No error occurs when:

• The --turbo option is not used.
• The target is a CSS file instead of an Scss file.

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: 10
Binaries:
  Node: 21.6.0
  npm: 10.2.4
  Yarn: 1.22.22
  pnpm: 9.15.0
Relevant Packages:
  next: 15.2.0-canary.66 // Latest available version is detected (15.2.0-canary.66).
  eslint-config-next: N/A
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.3
Next.js Config:
  output: N/A

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

Turbopack, CSS

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

next dev (local)

Additional context

No response