Thanks, that worked as described.
A student reported that they couldn't see the top half of a number that appeared in a problem. The fraction 3/20 was typeset, and for them the top half of the 3 was gone. I couldn't reproduce that exactly, but in Safari, at the right zoom level, I saw the top half of the 20 disappear.
After upgrading MathJax to 3.2.0, I can no longer make the top half of the 20 disappear.