Incorrect highlighting of HTML in mdx blocks

[jasongerbes]

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

Describe the bug

I previous versions of Shiki (^0.14.3), MDX code blocks had correct syntax highlighting for both markdown content and HTML code:

However, the latest version of Shiki (1.16.2) lacks syntax highlighting for HTML code within MDX blocks:

For reference, here's the MDX code snippet:

# Hello World!

<p className="lead">This is an introductory paragraph for the article.</p>

This is a standard markdown paragraph.

Reproduction

Using the Shiki playground (https://shiki.style), select MDX and paste the code snippet from above

Contributes

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests

[antfu]

It seems there are some changes in the upstream grammar: https://github.com/wooorm/markdown-tm-language/commits/0229d1b8fc37a7dea8cf7225d7713ac8a69621ca/source.mdx.tmLanguage

I don't know yet why it happens tho

[cworld1]

Is there any way to fix? I have to change code language set to jsx, but it causes some bad warnings for some code formatter.

[ezzatron]

I was looking into this, and I believe it's most likely caused by #887.