tex4ht fails with

make4ht -ulm default -a debug -c ./nma_mathjax.cfg index.tex 'mathjax,htm'

-----------------------------------

/usr/local/texlive/2023/texmf-dist/tex/latex/l3backend/l3backend-dvips.def)
(./index.aux) (/usr/local/texlive/2023/texmf-dist/tex/latex/base/ts1cmr.fd))
! Bad register code (65536).
\__regex_query_set_aux:nN ...__regex_curr_pos_int
{#1}\__kernel_intarray_gse...

l.209 \]

-----------------------------------

The code in index.tex is mostly Maple generated with few changes made by me. It compiles with no problem with Lualatex.

I can't figure the cause. Since it is little long (I did not want to change it, as not sure which line is the error coming from), I made ZIP file that contains everything needed to run it. The maple.sty file and my .cfg file.

The code is just one array

\[
\begin{array}{lll}
...
\end{array}
\]

The content of the ZIP file is

>ls -lrt

total 519
-rwxrwxrwx 1 me autologin 643 Jun 19 23:06 texput.log
-rwxrwxrwx 1 me autologin 135645 Jun 19 23:08 maple.sty
-rwxrwxrwx 1 me autologin 0 Jun 19 23:11 index.out
-rwxrwxrwx 1 me autologin 243929 Jun 19 23:11 index.pdf
-rwxrwxrwx 1 me autologin 77979 Jun 19 23:11 index.tex
-rwxrwxrwx 1 me autologin 17103 Jun 19 23:13 nma_mathjax.cfg
-rwxrwxrwx 1 me autologin 0 Jun 19 23:13 index.xref
-rwxrwxrwx 1 me autologin 21 Jun 19 23:13 index.tmp
-rwxrwxrwx 1 me autologin 83 Jun 19 23:13 index.4ct
-rwxrwxrwx 1 me autologin 92 Jun 19 23:17 index.aux
-rwxrwxrwx 1 me autologin 76 Jun 19 23:17 index.4tc
-rwxrwxrwx 1 me autologin 36921 Jun 19 23:17 index.log

After unzipping, cd to the folder june_20_2024/ created and run the command make4ht above to see the error.

I am attaching the ZIP (if this does not work, will make link)

TL 2023

Thanks
--Nasser