Cfr.
<https://github.com/latex3/latex2e/issues/1907#issuecomment-3745256830>
I'm attaching a MWE with the issue reported.
With the code proposed by davidcarlisle everything works fine.
Many thanks in advance,
Domenico
% !TeX TS-program = lualatex
% !TeX encoding = UTF-8 Unicode
% !TeX spellcheck = it_IT
% !TeX root = longtable.tex
\documentclass[b5paper]{memoir}
\usepackage{longtable}
% \ExplSyntaxOn
% \makeatletter
% \def\LT@output{%
% \ifnum\outputpenalty <-\@Mi
% \ifnum\outputpenalty > -\LT@end@pen
% \LT@err{floats~ and~ marginpars~ not~ allowed~ in~ a~ longtable}\@ehc
% \else
% \setbox\z@\vbox{\unvbox\@cclv}%
% \ifdim \ht\LT@lastfoot>\ht\LT@foot
% \dimen@\pagegoal
% \advance\dimen@\ht\LT@foot
% \advance\dimen@-\ht\LT@lastfoot
% \ifdim\dimen@<\ht\z@
% \setbox\@cclv\vbox{\unvbox\z@\copy\LT@foot\vskip 0pt plus \maxdimen minus \normalbaselineskip}%was vss
% \@makecol
% \@expl@@@mark@update@singlecol@structures@@
% \@outputpage
% \global\vsize\@colroom
% \setbox\z@\vbox{\box\LT@head}%
% \fi
% \fi
% \unvbox\z@\box\ifvoid\LT@lastfoot\LT@foot\else\LT@lastfoot\fi
% \UseTaggingSocket{tbl/longtable/foot}
% \fi
% \else
% \setbox\@cclv\vbox{\unvbox\@cclv\copy\LT@foot\vskip 0pt plus \maxdimen minus \normalbaselineskip}% was vss
% \UseTaggingSocket{tbl/longtable/foot}
% \@makecol
% \@expl@@@mark@update@singlecol@structures@@
% \@outputpage
% \global\vsize\@colroom
% \copy\LT@head\nobreak
% \fi}
% \makeatother
% \ExplSyntaxOff
\begin{document}
\begin{longtable}{llll}
\caption{Test}\\
\toprule
\textbf{b} & \textbf{b} & \textbf{b} & \textbf{b}\\
\midrule
\endfirsthead
\toprule
\textbf{b} & \textbf{b} & \textbf{b} & \textbf{b}\\
\midrule
\endhead
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
CC & CC & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
& a & a & a\\
& a & a & a\\
& a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\midrule
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
a & a & a & a\\
\bottomrule
\end{longtable}
\end{document}
%%% Local Variables:
%%% coding: utf-8
%%% mode: LaTeX
%%% TeX-engine: luatex
%%% TeX-master: "longtable"
%%% End:
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