Quotation marks in text mode in display math: a MathJax bug

I’ve tested this on the MathJax demo page and reported it as an issue on their GitHub page, but I thought I would mention it here as well in case it affects anyone else:

In one of my books, I have some introductory material on sets where I have the following example of a set:

  S = \{x : x \text{ is a letter in “pronghorns”}\}

(the Pronghorn being our mascot animal…)

If you do this, the equation displays correctly, but on the line below it, you’ll see

pronghorns’\text{.}\}\end{equation*}

The problem goes away if I use single quotes.