Seemingly wrong result from texmathp

[Al Haji-Ali]

I have the following tex snippet

\[
  \parbox{0.3\textwidth}{Dividing \( A \) by \(B\)}
  A / B
\]

If the point is before the parbox (but inside the equation), `(texmathp)` 
returns t as expected.
But if the point is after the parbox, `(texmathp)` always returns nil.

Is this a bug or am I missing something?

Best regards,
-- Al