different hyphenation between pdftex and luatex

[Harald Koenig]

Hi (Lua)TeX experts,

Marei Peischl noticed that using "*" for gender forms in german language
gives different hyphenation when using luatex and pdftex -- pdftex does not hyphenate, luatex does:

	$ pdftex '\hsize=5mm \showhyphens{nutzer*innengerechte}\bye' | egrep 'This|nutzer'
	This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021) (preloaded format=pdftex)
	[] \tenrm nutzer*innengerechte

	$ luatex '\hsize=5mm \showhyphens{nutzer*innengerechte}\bye' | egrep 'This|nutzer'
	This is LuaTeX, Version 1.13.2 (TeX Live 2021) 
	[] \tenrm nutzer*in-nen-gerechte

luatex gives same hyphenation as pdftex without that gender "*"

	$ pdftex '\hsize=5mm \showhyphens{nutzerinnengerechte}\bye' | egrep 'This|nutzer'
	This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021) (preloaded format=pdftex)
	[] \tenrm nutzerin-nen-gerechte
	

thanks for any insights;)

Harald
-- 
"I hope to die                                      ___       _____
before I *have* to use Microsoft Word.",           0--,|    /OOOOOOO\
Donald E. Knuth, 02-Oct-2001 in Tuebingen.        <_/  /  /OOOOOOOOOOO\
                                                    \  \/OOOOOOOOOOOOOOO\
                                                      \ OOOOOOOOOOOOOOOOO|//
                                                       \/\/\/\/\/\/\/\/\/
Harald Koenig                                           //  /     \\  \
harald.koenig at mailbox.org                              ^^^^^       ^^^^^