Error of foreach and node commands

[psparkmath]

Brief outline of the bug

I found that foreach command does not work well for \node.

I wrote the code \draw (P1) foreach \n in {2,3}{ -- (P\i) }; to draw lines connecting nodes P1, P2, P3, consecutively. But, this code draw lines connecting P1 and P2 and connecting P1 and P3.

If you change \node part to \coordinate, then foreach command works well.

Minimal working example (MWE)

\documentclass{article}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
\foreach[count=\i] \n in {1,3,2}{
    \node (P\i) at (\i,\n) {P\i};
%   \coordinate (P\i) at (\i,\n);
%   \node at (P\i) {P\i};
}
%\draw (P1) -- (P2) -- (P3);
\draw (P1) foreach \i in {2,3}{ -- (P\i)}; % <--- HERE!
\end{tikzpicture}
\end{document}

[jasperhabicht]

This is actually well-known. See, for example: https://tex.stackexchange.com/a/75152/47927

[hmenke]

As documented.

There is an undocumented option foreach[scope iterations=false] but it's undocumented for a reason, namely that in most of the cases it's broken.

[muzimuzhi]

Would be fixed by #1304 too?

[hmenke]

Yes. It's also a duplicate of https://github.com/pgf-tikz/pgf/issues/356 and https://github.com/pgf-tikz/pgf/issues/1303 and closely related to https://github.com/pgf-tikz/pgf/issues/1047.