Math formula rendering issue with hexo-renderer-marked@6.3.0

[sitJac]

Check List

• I have already read README.
• I have already searched existing issues and they are not help to me.
• I examined error or warning messages and it's difficult to solve.
• I am using the latest version of this repository.
• I am using the latest version of Hexo.
• My Node.js is matched the required version.

Describe the bug

When using hexo-renderer-marked@6.3.0 to build my blog system, there is an issue with rendering math formulas.

For example, the following math formula:

$$
\begin{cases}
u = f_x \frac{X}{Z} + c_x \\
v = f_y \frac{Y}{Z} + c_y
\end{cases}
$$

is supposed to be rendered as a two-line formula:

However, it is actually rendered as a single line:

Expected behavior

The math formula should be rendered as a two-line formula.

How to reproduce

1. Install hexo-renderer-marked@6.3.0 in a Hexo project.
2. Add the above math formula to a Markdown file.
3. Generate the site using hexo generate.
4. Open the generated HTML file in a browser.

Screenshots

No response

Environment information

- Hexo version: 7.3.0
- hexo-renderer-marked version: 6.3.0
- Node.js version: 16.20.2
- OS: Ubuntu 20.04

Additional context

No response

[uiolee]

As I know, marked is a renderer of markdown, not math.