Fontmake does not respect "Keep glyphs" parameter

[kosbarts]

Hello,

I am exporting a variable font straight from a Glyphs file and I have the Keep Glyphs parameter in both the named instances as well as the variable font instance in the Glyphs file.

Fontmake does not respect it and still exports the full exportable glyphs set.

I've tried adding --subset but the result is the same.

As per documentation fontmake is supposed to respect Keep Glyphs. Am I wrong?

Thanks