Building OTF and variable TTF from a Glyphs source with a Width axis results in incorrect naming in either static or variable fonts

[arrowtype]

Can FontMake produce accurate static OTFs and variable TTFs, with a width axis, from a single Glyphs source?

I’ve attempted to set up a GlyphsApp source with:

• A Weight axis
• A Width axis
• Instances that will output different sub-families in static fonts – one per main width location, like Familyname and Familyname Condensed, as is typical for weight+width superfamilies.
• Instances that will produce desired instance names in a variable font, including width descriptors

Main problem:

• If I set Glyphs data to produce accurate variable TTF instance naming, like Condensed Medium, the CFF table of OTFs gets duplicated width desriptors, like FamilynameCondensed-CondensedMedium
• If I set Glyphs data to produce accurate CFF table naming, like FamilynameCondensed-Medium, the variable font gets incorrect instance naming, with two instances called simply Medium

FontMake (or GlyphsLib?) problems:

1. The Localized Family Name and Localized Style Name properties of Glyphs Exports are sometimes ignored in building fonts.
2. name table entry Custom Properties are ignored when building names in the CFF table of OTF fonts.

Versions:

• FontMake 3.9.0 (also occurs with 3.8.1)
• GlyphsApp 3.2.3 (3260)

I’ve made a simplified reproduction, with multiple test cases, at https://github.com/arrowtype/test-fontmake-glyphs-build-cff-naming.

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Am I missing something? Thank you so much for any insights!

[arrowtype]

I’ve spent some time to further research and refine this issue, and I believe it fits better into the glyphsLib repo.

I’ve filed the new issue at googlefonts/glyphsLib#1028, and I’ll close this one.

Cheers!