Stray line on top of next page after longtable; persists for significant range of vertical location of table

[jfbu]

Brief outline of the bug

A stray line appears on top of page after a longtable.

Minimal example showing the bug

\RequirePackage{latexbug}
\documentclass[a4paper]{article}
\usepackage{longtable}
\begin{document}

\vspace*{16cm}% stray "line" at top of page 2
% shows with about from 15.9cm to 16.5cm
%

\section{A}

\begin{longtable}{|l|l|}
\hline
header1
&
header2
\\
\endfirsthead
\hline
header1
&
header2
\\
\endhead

\hline
\endfoot

\endlastfoot
cell1-1
&
cell1-2
\\
\hline

cell2-1
&
cell2-2
\\
\hline

cell3-1
&
cell3-2
\\
\hline
\end{longtable}

\section{B}


\end{document}

Log file (required) and possibly PDF file

testlongtablebug.log

[jfbu]

Should this be moved to https://github.com/davidcarlisle/dpctex/issues? I had forgotten about existence of the latter and the longtable.pdf does not mention it (it says This file is maintained by the LaTeX Project team).

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