Square brackets not shown in aligned environment

[yuchenxi2000]

• [x] Searched existing issues to avoid creating duplicates.

• [x] Confirmed that it can be reproduced in built-in themes without customized css.

  If it only exists in 3rd party themes or css, you can still report it, but please attach the theme target or the css file. We may not "fix" it, if it is caused by 3rd party themes or css styles that we cannot support.

• [x] Searched http://support.typora.io/

---

Describe the bug Square brackets not shown in aligned environment

To Reproduce Open file with contents below:

$$
\begin{aligned}
[a]
\end{aligned}
$$

$$
\begin{aligned}
a[a]
\end{aligned}
$$

The first equation [a] is invisible.

Screenshots / Screencasts

Sample Markdown File bug-report.md

Desktop (please complete the following information):

• OS: macOS 12.4

Typora Version 1.3.7

[abnerlee]

It is same with https://www.mathjax.org/#demo

Should it be displayed?

[abnerlee]

https://github.com/mathjax/MathJax/issues/2888

[yuchenxi2000]

Ok, it seems to be a MathJax issue.