\label{\detokenize{tabular:table-having-both-stub-columns-and-problematic-cell}}

\begin{savenotes}\sphinxattablestart
\centering
\begin{tabular}[t]{|*{3}{\X{1}{3}|}}
\hline
\sphinxstylethead{\sphinxstyletheadfamily 
header1
\unskip}\relax &\sphinxstylethead{\sphinxstyletheadfamily 
header2
\unskip}\relax &\sphinxstylethead{\sphinxstyletheadfamily 
header3
\unskip}\relax \\
\hline\sphinxstylethead{\sphinxstyletheadfamily \begin{itemize}
\item {} 
instub1-1a

\item {} 
instub1-1b

\end{itemize}
\unskip}\relax &\sphinxstylethead{\sphinxstyletheadfamily 
instub1-2
\unskip}\relax &
notinstub1-3
\\
\hline\sphinxstylethead{\sphinxstyletheadfamily 
cell2-1
\unskip}\relax &\sphinxstylethead{\sphinxstyletheadfamily 
cell2-2
\unskip}\relax &
cell2-3
\\
\hline
\end{tabular}
\par
\sphinxattableend\end{savenotes}
