[texhax] Bug in amsmath: footnote in intertext

[Victor Ivrii]

Footnote itself does not appear (but footnotemark appears in the text)

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
1+1=2
\intertext{we know this\footnote{because we are smart.}}
2+2=4
\end{align}
\end{document}
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