parcolumns, Vertical Misalignment of Columns

The columns produced by parcolumns are not vertically aligned. Why, and how can this be fixed using the parcolumns package as intended?

I have found similar questions with answers that I find unsuitable here:

Question (2) is essentially the same; however, I do not consider the accepted answer satisfactory.

Thanks to the comments below, the following code produces vertically aligned columns.

\documentclass[graybox,envcountchap,sectrefs]{svmono}

\usepackage{parcolumns}

\begin{document}

\begin{parcolumns}{2}
\colchunk{%
\section{Introduction}\null}
\colchunk{%
\section{Einf{\"u}hrung}\null}
\end{parcolumns}

\end{document}


Add \null (or \mbox{}) after each section so they both have content following them, and they'll be aligned.