Tex macros not rendering, also in documentation

Describe the problem

Tex Macros are not working as expected, as far as I can tell.

The example in the documentation does not appear to be rendering correctly, even within the online documentation. The documentation looks like this:

---

---

This does not look like the intended rendering. I get the same thing using the code from the documentation in my _config.yml file, specifically by adding this:

sphinx:
  config:
    mathjax3_config:
      TeX:
        Macros:
          "N": "\\mathbb{N}"
          "floor": ["\\lfloor#1\\rfloor", 1]
          "bmat" : ["\\left[\\begin{array}"]
          "emat" : ["\\end{array}\\right]"]

Note that I am using mathjax3_config (with the “3”) here, which I think is required.

It does correctly render using the math directive approach instead

```{math}
\newcommand\N{\mathbb{N}}
\newcommand\floor[1]{\lfloor#1\rfloor}
\newcommand{\bmat}{\left[\begin{array}}
\newcommand{\emat}{\end{array}\right]}

$$
A = \bmat{} 1 & 1 \\ 2 & 1\\ 3 & 2 \emat{},\ b=\bmat{} 2\\ 3 \\ 4\emat{},\ \gamma = 0.5
$$

which generates output like this:

So it looks like the _config.yml macros syntax has stopped working, including when the online documentation was generated.

Python version

3.9

Operating system

Mac OS 12

Package versions

Jupyter Book      : 0.12.1
External ToC      : 0.2.3
MyST-Parser       : 0.15.2
MyST-NB           : 0.13.1
Sphinx Book Theme : 0.1.9
Jupyter-Cache     : 0.4.3
NbClient          : 0.5.9

[stoffprof]

Wow, that’s a simple fix! Thanks!

[mmcky]

Sorry it took so long to get this sorted @stoffprof.