Hi @oneweioranother, I don’t know very well the specifications, but you cannot have hyphen in glyph names if you want to use your project outside Glyphs, Please see what @GeorgSeifert commented about hyphen:
And see what the OpenType Specifications says about glyph names:
###2.f.i. Glyph name
A glyph name may be up to 31 characters in length, must be entirely comprised of characters from the following set:
A-Z a-z 0-9 .(period)_(underscore)
[…]
###2.g.i. Ranges
A range of glyphs is denoted by a hyphen:
[<firstGlyph> - <lastGlyph>]
Spaces around the hyphen are not required since hyphens are not permitted in feature file glyph names. For example:
[\0-\31]
[A-Z]
For compatibility reasons (I think) you cannot export (outside Glyphs) a glyph with a name containing illegal characters like, pa-deva, or alef-ar or exceeding the 31 character length:
u069c.seenWith3DotsBelowAnd3DotsAbove
Some situations are going to export glyphs using its production name or eliminating the hyphen. I can be wrong about this but that is what I have discerned from comparing the original and the resulting glyph names using the FontLab’s macro “Glyphs Import”.
Best,
Nicolás