Inconsistent preview on GitHub and HackMD web IDE for ```cpp=```

[LuminaScript]

Is this a hackmd.io issue?

• [x] Yes, the bug happens on https://hackmd.io
• [ ] No. If it's a self-hosted CodiMD instance, please fire up the issue in the repo of CodiMD: https://github.com/hackmdio/codimd

What's the problem

Hackmd preview:

Hackmd markdown code:

GitHub Version:

Expected behaviour

(description of expected behaviour)

Environment

I use HackMD on:

Desktop

• OS: Windows 11
• Brower: Edge

Additional context

Add any other context about the problem here.