Strange bug with using \tag after \color

Created by: kwankyu

This is with MathJax version 3.

In the source webpage, after this math display

\[
	\begin{aligned}
	\color{red}{1}
	\end{aligned}
\]

I have this math display

\[\tag{S}
\]

On the rendered webpage, the second display shows a strange error

     \tag is not allowed in aligned environment

This seems a bug in MathJax.