"Keep glyphs" does not work in project export

I am trying to export a font family with a projects file. Chosing the ‘keep glyphs’ custom parameter to subset the font I get a compilation error of an alleged ‘syntax error’ in the class definitions at the first instance of a glyph that is no longer kept in the exported fonts (Error: “syntax error at “Z” [features.fea 44” in Class LETTERS_UC_LAT in line: 1).
I’ve tried defining the keep glyphs list as space separated, as well as one per line.

I have set all features and classes to be automatically generated.

Can you send me the .glyphs file please to support (at) (this website without www). I will have a look.

And the .glyphsProject file.