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