[tex-hyphen] Error in hypenation of Russsian accented «ы»

Sun Sep 18 23:11:04 CEST 2016

What file is responsible for the hyphenation patterns?

Is
it  /usr/local/texlive/2015/texmf-dist/tex/generic/hyph-utf8/patterns/tex/hyph-ru.tex
?

It contains line 4255

ы1

which means that any word can have a hyphen after «ы».

Do I understand it right?

But deleting this line does not help :-(
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