\documentclass{scrbook} % !!! This  shows the bug !!!
%\documentclass{book}

\usepackage{hyperref}

\begin{document}
\chapter{Bread types}%
\section{Free standing bread}
dedicated \nameref{ch:wheat-sourdough} chapter.

\chapter{Wheat sourdough}%
\label{ch:wheat-sourdough}

\end{document}
