Multiple instances of \end{document} cause empty notes

[Lycanic]

MWE (Test of End Document on LTI tool):

\documentclass{article}
\begin{document}
TEST 1
\end{document}
\end{document}

index.html for the document is entirely blank when this is compiled. Commenting out one of the \end{document}s allows a proper compilation (showing TEST 1)

Many lecturers use 'early' \end{document}s to cut notes short for different contexts whilst leaving the 'true' end in place, and LaTeX just stops at the first \end{document} (or I think more accurately, never begins a new document for the next to end).