Multi-cursor, multi-line snippets have indents eaten when certain characters are input

[rhinopotamus]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
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  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
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Description

Okay, so this is weird.
I have a multi-line snippet with a multi-cursor tab stop:

'\\begin{}...\\end{}':
    'prefix': '\\begin'
    'body': '\\\\begin{${1:env}}$2\n\t$0\n\\\\end{${1:env}}'

This works fine and properly inserts the snippet with proper indentation of the last line. However, if the next character I type is any of c d e m n o t u (and no other letters!), the indentation on the last line gets eaten.

Here's a little video that I hope will help clarify the actual behavior:

Steps to Reproduce

Expected behavior: Should preserve the indentation on the last line.

Actual behavior: The weird thing described above.

Reproduces how often: 100%

Versions

Atom version 1.32.2, Mac OS X 10.14.1.

[Aerijo]

Well that was weird. Turns out it's the auto indent going wonky. Try it with Settings > Editor > Auto Indent disabled.

Also turns out I suck at Jumble, because I only worked out the 'broken letters' spell document after the fact. Not sure why that's actually relevant, as the indentation regex is supposed to look for the whole word document, but seems definitely related.

Which Latex language package are you using?

[rhinopotamus]

I'm actually using your latex2e https://github.com/Aerijo/language-latex2e (version 0.18.0).

Good Jumble-ing! I wonder if it has to do with the fact that \begin{document} is somehow special.