Im von @saputello [verlinkten Beispiel][1] geht es durch Nachzeichnen der Pfeile mit der `InnerWhite`-Option.
Ganzes Beispiel:
[![alt text][2]][2]
\documentclass[a4paper, landscape]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
%\usetikzlibrary{shapes.arrows}
\pagestyle{empty}
\begin{document}
\def\L{8 cm}
\def\m{2mm}
\begin{tikzpicture}[
overlay, transform shape, remember picture, shift={(current page.center)},
%
every node/.style={
draw, circle, fill=black,
font=\sffamily\bfseries\Huge,
text=white,
outer sep=2*\m,
},
Pfeil/.style={
line width=0.5\m,
double distance=1.5*\m,
arrows = {-Latex[length=0pt 3 0, fill=white]},
line cap=rect,
%shorten >=5mm,
},
InnerWhite/.style={white,
line width=0.15*\m,
shorten >= 11.3/2*\m,
double distance=1.2*\m,
}
]
\coordinate[label=A] (A) at (-\L,-\L);
\coordinate[label=B] (B) at (\L,-\L);
\coordinate[label=C] (C) at (\L,\L);
\coordinate[label=D] (D) at (-\L,\L);
\coordinate[label=M] (M) at (-\L,0);
\coordinate[label=N] (N) at (\L,0);
% Rechteck
%\draw[] (A) rectangle (C);
% 12
\draw [Pfeil] (C) node[above right]{1} -- (A) ;
\draw [InnerWhite] (C) -- (A) ;
\draw [Pfeil,] ([xshift=-6*\m]A) node[below left]{2} -- ([xshift=-6*\m]C);
\draw [InnerWhite] ([xshift=-6*\m]A) -- ([xshift=-6*\m]C);
% 3 4
\draw [Pfeil] (B) node[below right]{3} -- (D) ;
\draw [InnerWhite] (B) -- (D) ;
\draw [Pfeil,] ([xshift=-6*\m]D) node[above left]{4} -- ([xshift=-6*\m]B);
\draw [InnerWhite] ([xshift=-6*\m]D) -- ([xshift=-6*\m]B);
% 6 7
\draw [Pfeil] ([yshift=-3*\m]M) node[left]{6} -- ([yshift=-3*\m]N);
\draw [InnerWhite] ([yshift=-3*\m]M) -- ([yshift=-3*\m]N);
\draw [Pfeil] ([yshift=3*\m]N) node[right]{7} -- ([yshift=3*\m]M);
\draw [InnerWhite] ([yshift=3*\m]N) -- ([yshift=3*\m]M);
% 5
\node[xshift=-3*\m]{5};
\end{tikzpicture}
\end{document}
[1]: http://www.texample.net/tikz/examples/double-arrows/
[2]: https://texwelt.de/wissen/upfiles/55555555_172.png
