chunkedhtml: --mathjax is not working properly

[wolfganghammer]

Explain the problem.
pandoc -t chunkedhtml --mathjax does not enable MathJax reliably in all chunks.

Exact command:

pandoc -t chunkedhtml -s --mathjax -o MathTest MathTest.md

Contents of MathTest.md:

# Chapter

Math: $y = \int_0^t u(t) dt$

## Section

Math: $y = \int_0^t u(t) dt$

Pandoc version 3.1.4 through 3.1.6 (x86_64-macOS):
The resulting HTML file MathTest/1-chapter.html is lacking the <scipt> element to include the MathJax code. Hence, the math formulae are rendered as plain text.

Pandoc version 3.1.3 (x86_64-macOS):
MathTest/1-chapter.html is created correctly.

Further observation:
When you change a heading to include math (e.g. # Chapter $x$), Pandoc 3.1.4 through 3.1.6 also include the MathJax script. This was likely broken in 40dacad to fix #8620. Notice that the test document in this issue does contain math in all headings.

[jgm]

Yes, that fix was buggy! I can see the problem at a glance.