Why does to [bend right] change the node placement behavior

Question

Consider the following example

\begin{tikzpicture}
\draw[<->] (0,0) -- (1,1) node[right,midway]{\small$\alpha$};  %
\draw[<->] (1,0) to [bend right]  (2,1) node[right,midway] {\small$\alpha$}; 
\end{tikzpicture}

With Tikz 2.1 the output looks like this

The second alpha is placed totally wrong just because the line is bent. This worked fine under texlive 2009 and tikz 2.00. Any Idea where this comes from ?

Answer 1

Just got it apparently the syntax changed:

\draw[<->] (1,0) to [bend right] node[right,midway] {\small$\alpha$} (2,1) ;

works.