How can I center the dot in the first part of box?

Question

How can I center the dot in the first part of box? I want to make it look symmetrical. But don't know why the dot and arrow just won't center in the first part of box like the third part of box.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc,shapes.multipart,chains,arrows.meta}

\begin{document}
\begin{tikzpicture}[
   list/.style={minimum size=9mm,
   rectangle split,
   rectangle split parts=3,
   draw,
   rectangle split horizontal
},
   dotarrow/.style={Circle-Stealth},
   start chain
   ]
   \node[list,on chain] (A) {};
   \node[left of=A,xshift=-3mm] (1) {};
   \node[right of=A,xshift=3mm] (2) {};

   \draw[dotarrow] (A.three |- A.center) -- (2);
   \draw[dotarrow] (A.one |- A.center) -- (1);

 \end{tikzpicture}
 \end{document}

Answer 1

There's two problems. One is that as Percusse points out, the circle at the beginning of the dotarrow doesn't go exactly at the coordinate given. The second problem is that the A.one and A.three anchors appear to be in slightly odd locations. The easy solution to the first problem is to put a node with shape a filled circle at the end of your arrow. A harder solution would be to make a modified version of the dot arrowhead with no offset. It seems like the easy solution is sufficient here.

To solve the second problem, it appears that the anchor A.one south is located at the center of the bottom edge of the region. So to get the two edges say:

\tikzset{dot/.style={circle,fill, inner sep=1.3pt}}
\draw (A.three south |- A.center) node[dot]{} -- (2);
\draw (A.one south |- A.center) node[dot]{} -- (1);

The complete example:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc,shapes.multipart,chains,arrows.meta}

\begin{document}
\begin{tikzpicture}[
   list/.style={minimum size=9mm,
   rectangle split,
   rectangle split parts=3,
   draw,
   rectangle split horizontal
},
   dot/.style={circle,fill, inner sep=1.3pt},
   -Stealth,
   start chain
   ]
   \node[list,on chain] (A) {};
   \node[left of=A,xshift=-3mm] (1) {};
   \node[right of=A,xshift=3mm] (2) {};

   \draw (A.three south |- A.center) node[dot]{} -- (2);
   \draw (A.one south |- A.center) node[dot]{} -- (1);
 \end{tikzpicture}
 \end{document}