Aditya came across this in 2011 ([NTG-context] export kills hyphen 
symbol 
<https://www.mail-archive.com/ntg-context@ntg.nl/msg58460.html>)[1] with 
the Fontin font. It wasn’t answered then. It is back if it ever left.

Here is an example:

    \definefontfamily
         [TestFont]
         [rm]
         [Antykwa Torunska Cond]
    \setupbodyfont
         [TestFont]
    \setupbackend
         [export=maybe]% or yes, or no, or ...
    \setuppapersize
         [A7]
    \starttext
    \input ward
    \stoptext

If the \setupbackend statement is removed, or an invalid key is used, 
all is well. It fails with a valid key and any value for that key.

I am experiencing the problem of missing hyphens with this font even 
without \setupbackend, but cannot yet construct a working example.

-- 
Rik

[1] https://www.mail-archive.com/ntg-context@ntg.nl/msg58460.html