While the bug is being fixed, here is a quick band-aid for anyone else
struggling with this problem.

1. When the export hangs up, press C-g to interrupt.
2. Run the following on the intermediate tex file, here exported.tex :
   sed -i 's/\[,/\[/g' exported.tex
3. Run pdflatex by hand:
   pdflatex exported.tex


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