How to Properly Display Array-Type Math Equations

[jycoast]

I use markdown-it-mathjax3：

markdown: {
    math: true
}

Most of it works well, but the display of array-type equations is not normal.

$ f[i][j] $ is displayed as $f\[i]\[j]$, i want to display as $f[i][j]$.

for example：

is displayed as

Repo： https://github.com/jycoast/algorithm-wiki/blob/main/docs/leetcode/longest-palindromic-substring.md

preview address：https://algorithm-wiki.pages.dev/leetcode/longest-palindromic-substring#%E6%96%B9%E6%B3%95%E4%B8%80-%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92

What should I do to display it in the way I want?

Thank you for your help.