[NTG-context] \switchtobodyfont issue

I have the following: \starttext A. \switchtobodyfont[10pt]{ First published by Stojan Novaković in 1877 in his anthology \modCyr{\emph{Примери књижевности и jезика старога и српско-словенскога}} (Belgrade/\modCyr{Београд: Издање и штампа државне штампариjе}, pp.\ 504–505). } \blank[big,fixed] B. \switchtobodyfont[9pt]{ First published by Stojan Novaković in 1877 in his anthology \modCyr{\emph{Примери књижевности и jезика старога и српско-словенскога}} (Belgrade/\modCyrfn{Београд: Издање и штампа државне штампариjе}, pp.\ 504–505). } \stoptext This works as expected at 10pt but fails at 9pt (no Russian is printed). The problem does not seem to be with dejavu. I have plainly missed something. But what? Alan