I'm using polyglossia package in my document and have some parts where I don't want to have hyphynation so I'm using \disablehyphenation command as documented. Now when I'm having very long words in a line I would expect the second long word to go to the next line (see section 1 in the image below). But when the first word gets shorter the second one does no longer go to the second line.

Here is my MWE:
\documentclass{scrartcl}
\usepackage{polyglossia}
\begin{document}
\fontsize{30}{30}\selectfont
\disablehyphenation
\section{expected}
Aquickbrownfoxjumpsoverthelazydog Aquickbrownfoxjumpsoverthelazydog
\section{unexpected}
Aquickbrownfoxjumpsoverthelazy Aquickbrownfoxjumpsoverthelazydog
\end{document}
Any ideas how to force the second word to be on the next line? (manual Newline is no option - its generated content)
Thanks in advance!

\sloppywill persist through the entire document unless delimited. usually, it's better to use\begin{sloppypar} ... \end{sloppypar}around just the affected region. (been recommended before: How to avoid using \sloppy document-wide to fix overfull \hbox problems?) – barbara beeton Apr 09 '15 at 15:45"Really ReallyLongLongLongLongLongLongLongLongLongLongLongLongWord"– nis Apr 10 '15 at 12:29