incorrect pdf Operator S #507
Description
Brief outline of the bug
PDF Accessibility Checker says that the MWE leads to two errors because Operator 'S' not allowed in this current state. The pdf file has S at the following lines:
299 97.13599 80.69843 m
...
324 S
...
528 97.13599 80.69843 m
529 B
530 S
Looking at the PDF 1.7 spec (https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf), I think Figure 9 (p113) says that the m operator begins a path object, and that Section 8.5.3.1 (p134) says the first S or B operator ends the path object. I think this means that the S on line 530 is invalid. Would it be possible to not have a superfluous S operation? Where in the code do the B and S operators originate?
Minimal working example (MWE)
% !TEX program = LuaLaTeX
\DocumentMetadata{testphase=latest,lang=en,pdfversion=1.7,pdfstandard=ua-1,uncompress}
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\title{title}
\begin{document}
\begin{tikzpicture}[alt={alt text}]
\begin{axis}[xmin=-1,xmax=1,ymin=0,ymax=1,axis x line=none,axis y line=none]
\addplot[mark=*,draw=black](0,.5);
\end{axis}
\end{tikzpicture}
\end{document}