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