Some Latex code can't be valid.

[SouthernWolf123]

Description

• Can you reproduce the issue?

Steps to reproduce

1. type $$, and enter. so that I can type latex.
2. type

\begin{align} 
& 1+2+3 \\
=&3+3 \\
=&6
\end{align}

3. then it says invaild

Expected behavior:

1+2+3
=3+3
=6
Actual behavior:

<Invalid Mathematical Formula>

Versions

• MarkText version:0.16.3
• Operating system:win10 LTSC

[DYH-Hong]

Dup of #2573

[fxha]

Closing as I cannot reproduce this issue with our latest develop version (we updated KaTeX in December).