Katex not rendering in PDF export

[jeremyfreedman]

Description

When exporting documents to PDF with Katex present, the Katex portions appear as whitespace.
As an example, the below images are the same note, the first being a screenshot from the Joplin application and the second from my PDF renderer (I tried multiple):

Environment

Joplin version: 1.0.200
Platform: Windows 10 Pro
OS specifics: x64 Version 1909 (18363.720)

Steps to reproduce

1. Create a new note.
2. Write some in-line math using Katex (ie. $1+1=2$)
3. Export to PDF using File -> Export -> PDF - PDF File
4. Open the PDF in any PDF viewer and check if the Katex you entered is visible.

Describe what you expected to happen

The lines should be visible and typesetted properly using Katex.

Logfile

The console raises no errors or warnings when exporting. The log file (log.txt) does not print anything when exporting whatsoever.

[laurent22]

Please provide a full note that can be used to replicate the bug.

[tessus]

I can't reproduce this, but I'm on macOS. Here's a test file:

# Matrix

$$
\begin{pmatrix}
    a & b & c\\
    a & b & c\\
    a & b & c\\
    a & b & c
\end{pmatrix}
$$

# Standard Deviation

$\bar{x}$ = the mean, or average, of all data points in the problem 
x = an individual data point 
N = the number of points in the data set

$$
\sigma = \sqrt{\frac 1 N \sum_{i=1}^N(x_i-\bar{x})^2}
$$

# Katex Documentation

https://katex.org/docs/supported.html

# Color Test

$\colorbox{red}{A}$

# Symbols

$$ 
\text{\textasciicircum}
$$

$$ 
\text{\textasciitilde} 
$$

However, for some reason the matrix looks like this in the PDF:

while in Joplin it looks perfectly fine:

[jeremyfreedman]

Please provide a full note that can be used to replicate the bug.

Github wouldn't take an .md file, I had to rename to .txt. I included the Joplin-produced PDF as well, which is missing Katex rendering.

Test Katex.md
ENGRD 2300 - Test Katex.pdf