% A group around one node is decoration and must dirty the build.
\documentclass[border=2pt]{standalone}
\usepackage[en]{superfig}
\sfsetrole{x}{sfTeal}
\begin{document}\begin{tikzpicture}
\sfnode[role=x, at={(0,0)}]{A}{A}{12mm}{8mm}
\sfgroup[role=x]{G}{(A)}{}
\end{tikzpicture}\end{document}