When I compile this plain tex example with luatex:
\hsize=2em
abc \hbox to 1em{}sentence.
\hyphenationbounds=1
abc \hbox to 1em{}sentence.
\noindent\hbox to 1em{}sentence.
\bye
then hyphenationbounds=1 suppresses the hyphenation for the first
"\hbox to 1em{}sentence." but not in the second case where the word
is at the start of a paragraph.
Is this to be expected or a bug?
(This is LuaTeX, Version 1.0.4 (TeX Live 2017/W32TeX) )
--
Ulrike Fischer
http://www.troubleshooting-tex.de/
