E.g. for https://en.wikipedia.org/wiki/Douglas_SBD_Dauntless and https://en.wikipedia.org/wiki/Martin_B-26_Marauder:
Report as ticket ID 8143373
```alex@alex-laptop:~/Development/MediaWiki/extensions/Collection ((7e672d3...))$ ./mw-ocg-bundler/bin/mw-ocg-bundler -v -o bundle.zip --prefix enwiki "Martin_B-26_Marauder"
[...]
alex@alex-laptop:~/Development/MediaWiki/extensions/Collection ((7e672d3...))$ ./mw-ocg-latexer/bin/mw-ocg-latexer -v -D -o OTRS8143373.pdf bundle.zip
[...]
[75%] Compiling PDF
This is XeTeX, Version 3.1415926-2.5-0.9999.3 (TeX Live 2013/Debian)
restricted \write18 enabled.
entering extended mode
(./output.tex
LaTeX2e <2011/06/27>
[...]
Underfull \hbox (badness 10000) in paragraph at lines 190--190
<use "/tmp/mw-ocg-latexer5390hgjph74/bundle/images/tmp-4179qm2f82o.jpg" >
<use "/tmp/mw-ocg-latexer5390hgjph74/bundle/images/tmp-4179nexany8.jpg" >
[6]
! Missing \endgroup inserted.
<inserted text>
\endgroup
l.227 }]
\end{description}
Output written on output.pdf (6 pages).
Transcript written on output.log.
---------------------------------------
** WARNING ** Failed to convert input string to UTF16...
---------------------------------------
Error: Latex Error! Check your latex string
at /home/alex/Development/MediaWiki/extensions/Collection/mw-ocg-latexer/node_modules/gammalatex/app.js:72:12
at CB (/home/alex/Development/MediaWiki/extensions/Collection/mw-ocg-latexer/node_modules/gammalatex/node_modules/rimraf/rimraf.js:68:5)
at Object.oncomplete (fs.js:107:15)```
I have outdated copies of the bundler and latexer, but this also occurs in production.