[NTG-context] UTF-8 characters being dropped from typefile

[ntg at scorecrow.com]

Sorry for this really, really basic question but...

I have the following 3 line source file:

\starttext
\typefile{test-listing.txt}
\stoptext

The file "test-listing.txt" is UTF-8 and includes the character U+25B8 (black right-pointing small triangle) which is being dropped from the output.

The console shows:

fonts           > checking > char ▸ (U+025B8) in font 'LMMono12-Regular' with id 8: missing

Which explains why the character is being dropped. What I don't understand is why is LMMono12-Regular being used? I thought I had read somewhere that TeX Gyre fonts were now the default (I'm on ConTeXt  ver: 2020.11.05 23:01 LMTX) ?

If not, is there an installation level config  setting to make them the default or do I need to work out the relevant \start ... \stoptypescript commands?

Thanks in advance.
--
Bruce Horrocks
Hampshire, UK