[TeX] amscd unexpected shift

The following example does not match the rendering in real LaTeX.

\require{AMScd}
\begin{equation*}
 \begin{CD}
  \mathcal{O}_Y &@>\varepsilon (\mathcal{O}_Y)>> &L \\
  @VfVV && @VVL\otimes fV \\
  \mathcal{O}_y &@>\varepsilon (\mathcal{O}_y)>> &\,\mathcal{O}_y
 \end{CD} 
\end{equation*}

The arrow pointing down on the left side of the square is not aligned correctly with its top and bottom.