[NTG-context] Inconsistencies with fonts/c2sc feature

[Kirill Davidov <davidov_ka@edu.surgu.ru>]

Greetings,

I have been trying to make font feature sets that allow me to write
abbreviations in small caps and corporate entity/product/etc names with
small caps replacing regular ones. I have run into an issue where c2sc
works as intended on some fonts and not in others. No idea what that's
about. MWE:

%\definefontfeature [default] [default] [script=latin]
\definefontfeature [default] [default] [script=cyrillic]
\definefontfeature [capstosc] [c2sc=yes]
\definefontfeature [smallcaps] [cpsp=yes, smcp=yes, lowercasing=yes]

\setupbodyfont[stix]
%\setupbodyfont[newcomputermodern-book]

\starttext

{\language[ru]Моя любимая
{\feature[+][smallcaps]ОС}---{\feature[+][capstosc]Линукс}.}\crlf
{\language[en]My favourite {\feature[+][smallcaps]OS} is
{\feature[+][capstosc]Linux}.}

\stoptext

With STIX Two, c2sc (and smcp) works with any language as long as one
doesn't select a script in the font features, else it only works with
the chosen script. With New Computer Modern, it just doesn't work with
any latin text no matter the script chosen. That is, plain small caps
work, caps to small caps don't. What could be the reason to it? Is there
anything I could do to mitigate it?

Kirill

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