Opening a UFO and then exporting to UFO removes these keys from fontinfo.plist:
openTypeNameDescription
openTypeOS2Type
openTypeOS2VendorID
These do end up in private Glyphs keys in lib.plist, so they are getting imported, but are not being written on export.
Thanks for the report. I fixed it.
@GeorgSeifert I recently noticed that the Use Typo Metrics parameter is not converted to openTypeOS2Selection when export from .glyphs to .ufo.
Version 2.6.7 (1358)
That is a bit tricky. As the openTypeOS2Selection contains more than that. There are several more bits to set and it isn’t done for all the others, too. And I will not fix this for Glyphs 2.