[luatex] Doesn't hyphenationbounds work for first word of a paragraph?

Ulrike Fischer luatex at nililand.de
Wed Jun 14 10:39:42 CEST 2017

When I compile this plain tex example with luatex:

abc \hbox to 1em{}sentence.

abc \hbox to 1em{}sentence. 

\noindent\hbox to 1em{}sentence.


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 

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