Mermaid renders as code

[aleksandr-makarov-dev]

Link to the code that reproduces this issue

https://github.com/aleksandrmakarov-dev/my-static-site

To Reproduce

1. Deploy repository on Vercel
2. Open page with mermaid diagram (/tasks/event-organizer)

Current vs. Expected behavior

I expect to see mermaid diagram, but instead I see code

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Pro
Binaries:
  Node: 20.15.1
  npm: N/A
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 13.5.6
  eslint-config-next: N/A
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 4.9.5
Next.js Config:
  output: N/A

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

Markdown (MDX)

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

Vercel (Deployed)

Additional context

If I open the same page in dev mode or if I build app in local environment and start it I can see mermaid diagram rendered normally, but If I deploy it on vercel I see it rendered as code

[github-actions]

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