I'm writing a document in German using LuaTeX on windows with a MiKTeX installation. I use some words with hyphens, e.g. Baden-Württemberg. Using the LuaTeX specific \hyphenation{Ba-den=Würt-tem-berg} worked find until I updated to miktex 2.9.6600 and LuaTex 1.07 lately.
Now, I cannot find a way to tell TeX the right hyphenation. With the old version, it would insert a hyphen at any specified position, if needed. With the new, only the - between Baden and Württemberg is used.
I made a MWE to show, that \hyphenation still works for normal words but not for those with dash:
\documentclass[ngerman,12pt,a4paper]{report}
\usepackage[ngerman]{babel}
\hyphenation{Ba-den=Würt-tem-berg Fluss-be-tt}
\usepackage{showhyphens}
\begin{document}
\parbox{0pt}{Baden-Württemberg}
\parbox{0pt}{Flussbett}
\end{document}
The result should begin a new line at every possibility given by \hyphenation. But this does only work for "Flussbett":
So either the usage of \hyphenation in LuaTeX has changed or this is a bug of the current version.
Can you confirm this or correct my usage of \hyphenation? And if it is an unknown bug, can you tell me where I can report it?

\parbox{0pt}{Baden"-Württemberg}, where"-is thebabelshortcut for "allow hyphenation in the words immediately before and after the hyphen"? – Mico Jan 30 '18 at 17:45"-convention, luatex can (could) hyphenate words with explicit hyphens – David Carlisle Jan 31 '18 at 07:41hyperrefto the current version, rather than being locked into (say) TeXLive 2015 packages (as with Ubuntu 16.04 distro). Am I wrong? – Jan 31 '18 at 22:54