LaTeX display math issues

[kaibagley]

Hey, thanks for the great package!

Trying to use this to export some code:

\[
\underbrace{
\begin{bmatrix}
    y_{1i} \\
    \vdots \\
    y_{mi}
\end{bmatrix}
}_{\mathbf{y}_i}
=
\underbrace{
\begin{bmatrix}
    \beta_{11} &        & \beta_{1(p+1)} \\
               & \ddots &                \\
    \beta_{m1} &        & \beta_{m(p+1)}
\end{bmatrix}
}_{B^\intercal}
\underbrace{
\begin{bmatrix}
    x_{1i}     \\
    \vdots     \\
    x_{(p+1)i}
\end{bmatrix}
}_{\mathbf{x}_i} 
-
\underbrace{
\begin{bmatrix}
    \varepsilon_{i1} \\
    \vdots           \\
    \varepsilon_{im}
\end{bmatrix}
}_{\mathbf{\varepsilon}_i}
\]

But I have 2 problems:

1. The minus on its own like gets exported as as a list item (i think), and causes some symbols to be double slashed.
2. I think either the underbraces or the \\ cause issues when only $$ or \[ are used as the math delimiters. When I use \begin{aligned}...\end{aligned} inside the math environment they then render properly

This is how it appears in the output markdown:

> \\[
> \underbrace{
>
> \begin{bmatrix}
>     y\_{1i} \\\\
>     \vdots \\\\
>     y\_{mi}
> \end{bmatrix}
>
> }<sub>\mathbf{y}_i</sub>
> =
> \underbrace{
>
> \begin{bmatrix}
>     \beta\_{11} &        & \beta\_{1(p+1)} \\\\
>                & \ddots &                \\\\
>     \beta\_{m1} &        & \beta\_{m(p+1)}
> \end{bmatrix}
>
> }<sub>B^\intercal</sub>
> \underbrace{
>
> \begin{bmatrix}
>     x\_{1i}     \\\\
>     \vdots     \\\\
>     x\_{(p+1)i}
> \end{bmatrix}
>
> }<sub>\mathbf{x}_i</sub> +
> \underbrace{
>
> \begin{bmatrix}
>     \varepsilon\_{i1} \\\\
>     \vdots           \\\\
>     \varepsilon\_{im}
> \end{bmatrix}
>
> }<sub>\mathbf{\varepsilon}_i</sub>
> \\]

There are <sub> ... </sub> elements in there

Thanks a lot!

[kaibagley]

Ive discovered that if I use an aligned environment within the display math, then it will render everything properly. For some reason, with the plain equation environment, it adds those sub elements

[gongshangzheng]

I've got the same problem here. So I tried to set tex to dvisvgm. Then I've got another problem.
In the file, I've got a link like this: <img src="/ltximg/20260131165525-ditok_0db93df8e5e91087118ce522a15f3261f9e0880f.svg" alt="$\pi_0$" class="org-svg" />, but what it actually exports has a diffrent name like "org-ltximg_0993a7e1e0f503d4686c295612498d239bd8dccc.svg". So, this function just can't work fine.