MDX integration will not work with dynamic route import

[CNLHC]

Link to the code that reproduces this issue

https://github.com/CNLHC/next-mdx-dynamic-route-reproduce.git

To Reproduce

1. git clone https://github.com/CNLHC/next-mdx-dynamic-route-reproduce.git
2. pnpm i
3. pnpm next
4. access http://localhost:3000/content/test

Current vs. Expected behavior

Current this process will cause Module Not Found Error

Expected behavior is render markdown file properly.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:23 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6031
  Available memory (MB): 131072
  Available CPU cores: 16
Binaries:
  Node: 23.1.0
  npm: 10.9.0
  Yarn: 1.22.17
  pnpm: 10.6.2
Relevant Packages:
  next: 15.2.3 // Latest available version is detected (15.2.3).
  eslint-config-next: N/A
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.8.2
Next.js Config:
  output: N/A

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

Dynamic Routes

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

next dev (local)

Additional context

This issue is similar to the #51324

Since import will work if we use static string instead of variable.