I’ve decided to buy the Optima Nova font. But now that I use it, I run into the problem that suddenly my fallback for Cyrillic has stopped working.

\definefallbackfamily
  [archimate]
  [ss]
  [Helvetica]
  [preset=range:cyrillic,
   tf=style:light,
   it=style:lightoblique,
   bf=style:regular,
   bi=style:oblique,
   force=yes,
   rscale=1.0]
\definefontfamily
    [archimate]
    [ss]
  [OptimaLT-Medium]
\setupbodyfont[archimate]

\starttext

The quick brown fox jumped over the lazy dog. Ядро метамодели.

\stoptext

With

\definefontfamily
    [archimate]
    [ss]
  [Optima]

Cyrillic fallback works (as does the old Optima). What do I need to do to remedy that?

Thanks,

G