expansion of key-value package options differ on the first and second call about latex2e

[muzimuzhi]

This is similar to #580, but for already-loaded packages.

I already opened #1300 to fix this. For an example with patch to play with,

%\RequirePackage{latexbug}       % <--should be always the first line (see CONTRIBUTING)!
\documentclass{article}
\usepackage{etoolbox}

\makeatletter
% \load@onefilewithoptions is let to \@onefilewithoptions
\patchcmd{\load@onefilewithoptions}
  {\@namedef{@raw@opt@\@currname.\@currext}{#2}}
  {\expandafter\def\csname @raw@opt@\@currname.\@currext\expandafter\endcsname\expandafter{#2}}
  {}{\PatchFailed}
\makeatother

\def\myoption{dvipsnames,svgnames}
\usepackage[\myoption]{xcolor}\relax %works

\def\mysecondoption{svgnames}
\usepackage[\mysecondoption]{xcolor} %errors

\begin{document}

Some words.

\end{document}

[muzimuzhi]

Need be reopened and labeled fixed in dev Fixed in development branch, not in stable release ?