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

\begin{savenotes}\sphinxattablestart
\sphinxthistablewithglobalstyle
\centering
\begin{tabular}[t]{|*{3}{\X{1}{3}|}}
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header1
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\\
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\sphinxtableatstartofbodyhook\sphinxstyletheadfamily \begin{itemize}
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instub1\sphinxhyphen{}1a

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instub1\sphinxhyphen{}1b

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\end{tabular}
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\sphinxattableend\end{savenotes}