The category

https://en.wikipedia.org/wiki/Category:Pages_that_use_a_deprecated_format_of_the_math_tags

created to detect deprecated syntax in related to T197842 is giving some false positives.

The minimum false positive example is <math>\%<math> indeed anything with an escaped % seems to trigger the category.

Another problem is mentioned in https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:WikiProject_Mathematics&oldid=994978378

<math>E\lor F</math> E ∨ F {\displaystyle E\lor F} {\displaystyle E\lor F} is triggering the error category, but <math>\lor</math> is fine.