Incorrect escaping in Markdown preview

Test document:

Before
\"
After

Expected output:

Before
"
After

Actual output: nothing.

Testing with the marked command (version 1.1.0) from marked.js, correct HTML is generated:

<p>Before
&quot;
After</p>

There's nothing in the marked.js release notes for 1.1.0 about fixing any issue like this so presumably it's not a bug present in the 1.0.0 version bundled with Builder.

This doesn't happen with any other common special character (tested with those directly available on an English keyboard) if it follows a backslash, only a ".