problem with tex4ht 20200327

[wasser mai]

Dear TeX Live team,

i have  a small test file for tex4ht. With the call of htlatex
test.tex "html,gif", the test0x.gif, test1x.gif files and other
dvi/html files should be created.  I tested with tex4ht 2019 and the
test file works as expected.

With tex4ht 20200323, it creates only test0x.gif file and other
dvi/html files. The test1x.gif was not generated.

Is it a bug in tex4ht 20200323 or texlive?

Thank you so much!

My machine is running Fedora 33 and texlive 20200323. My test.tex (cat
test.tex):

\documentclass{article}
\usepackage{mathtools}

\begin{document}
\section{First section}
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua.
\section{Second section}
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fug
iat nulla pariatur. Excepteur sint occaecat cupidatat non proident,
sunt in culpa qui officia deserunt mollit anim id est laborum.

\LaTeX testing file

\subsubsection{Basic formulas}
\[ f(n) = \left\{
   \begin{array}{l l}
             n/2 & \quad \text{if $n$ is even}\\
        -(n+1)/2 & \quad \text{if $n$ is odd}
   \end{array} \right.
\]

\[ 50 \textrm{ apples} \times 100 \textbf{ apples} = \textit{lots of
apples}^2 \]
\end{document}