Steps to Reproduce: See Wikiversity:Mathematics/Calculuses. Google sees it, too.

Actual Results: Instead of the png a tag like UNIQ--postMath-00000001-QINU is shown.

Expected Results: The TeX code is rendered into a PNG image.

I can't tell whether this is related to T138453. If it is, maybe someone should fix a high-priority issue reported more than two years ago at some point.