make4ht longtable issue, captions that should appear in footer appear in header, and they appear twice

[cjohn001]

Below code results in the issue. Expected is that the caption should be set below the table on each page (if table spans multiple pages)

\begin{longtable}[!ht]{|>{\centering\arraybackslash}p{0.3\linewidth}|>{\raggedright\arraybackslash}p{0.3\linewidth}|>{\raggedright\arraybackslash}p{0.31\linewidth}|}
    \hline \multicolumn{1}{|c|}{\textbf{Nutrient}} & \multicolumn{1}{c|}{\textbf{Function}} & \multicolumn{1}{c|}{\textbf{Nutrient Source}} \\  \hline
    \endfirsthead
    \hline \multicolumn{1}{|c|}{\textbf{Nutrient}} & \multicolumn{1}{c|}{\textbf{Function}} & \multicolumn{1}{c|}{\textbf{Nutrient Source}} \\  \hline
    \endhead
    \caption{Footer caption 1}
    \endfoot
    \caption{Footer caption}
    \label{tab:fats}
    \endfirstfoot

    test        \newline(\some text)    & text                                   & test                                          \\ \hline
    test        \newline(\some text)    & text                                   & test oil                                      \\ \hline
\end{longtable}

The problem also arises without \endfirstfoot. \endfirstfoot is defined as below:

\makeatletter
\newbox\LT@firstfoot
\def\endfirstfoot{\LT@end@hd@ft\LT@firstfoot}
\newdimen\LT@footdiff
\def\LT@start{%
    \let\LT@start\endgraf
    \endgraf\penalty\z@
    \vskip\LTpre\endgraf
    \LT@footdiff-\ht\LT@foot
    \advance\LT@footdiff\ht\LT@firstfoot
    \dimen@\pagetotal
    \advance\dimen@ \ht\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi
    \advance\dimen@ \dp\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi
    \advance\dimen@ \ht\ifvoid\LT@firstfoot\LT@foot\else\LT@firstfoot\fi
    \dimen@ii\vfuzz
    \vfuzz\maxdimen
    \setbox\tw@\copy\z@
    \setbox\tw@\vsplit\tw@ to \ht\@arstrutbox
    \setbox\tw@\vbox{\unvbox\tw@}%
    \vfuzz\dimen@ii
    \advance\dimen@ \ht
    \ifdim\ht\@arstrutbox>\ht\tw@\@arstrutbox\else\tw@\fi
    \advance\dimen@\dp
    \ifdim\dp\@arstrutbox>\dp\tw@\@arstrutbox\else\tw@\fi
    \advance\dimen@ -\pagegoal
    \ifdim \dimen@>\z@\vfil\break\fi
    \global\@colroom\@colht
    \ifvoid\LT@firstfoot
        \ifvoid\LT@foot
        \else
            \advance\vsize-\ht\LT@foot
            \global\advance\@colroom-\ht\LT@foot
            \dimen@\pagegoal\advance\dimen@-\ht\LT@foot\pagegoal\dimen@
            \maxdepth\z@
        \fi
    \else
        \advance\vsize-\ht\LT@firstfoot
        \global\advance\@colroom-\ht\LT@firstfoot
        \dimen@\pagegoal\advance\dimen@-\ht\LT@firstfoot\pagegoal\dimen@
        \maxdepth\z@
    \fi
    \ifvoid\LT@firsthead\copy\LT@head\else\box\LT@firsthead\fi\nobreak
    \output{\LT@output}%
}
\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@lastfoot
                \ifdim\dimen@<\ht\z@
                    \setbox\@cclv\vbox{\unvbox\z@\copy\LT@foot\vss}%
                    \@makecol
                    \@outputpage
                    \setbox\z@\vbox{\box\LT@head}%
                \fi
            \fi
            \global\@colroom\@colht
            \global\vsize\@colht
            \vbox
            {\unvbox\z@\box\ifvoid\LT@lastfoot\LT@foot\else\LT@lastfoot\fi}%
        \fi
    \else
        \ifvoid\LT@firstfoot
            \setbox\@cclv\vbox{\unvbox\@cclv\copy\LT@foot\vss}%
            \@makecol
            \@outputpage
            \global\vsize\@colroom
        \else
            \setbox\@cclv\vbox{\unvbox\@cclv\box\LT@firstfoot\vss}%
            \@makecol
            \@outputpage
            \global\advance\@colroom\LT@footdiff
            \global\vsize\@colroom
        \fi
        \copy\LT@head\nobreak
    \fi
}
\makeatother