I think that the target users are few, but I will report it just in case.
The following error occurs when exporting OTF (PostScript/CFF) on older macOS (10.13.x or earlier).
This error occurs in version 3210 and later. (Version 3212 is the same)
This error did not occur in version 3209.
This error does not occur on macOS Mojave (10.14.x) or later.
Error Details:
There was a problem converting to CFF. (Regular)
tx: (cfw) unhinted <.notdef>
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
Referenced from: /Applications/Glyphs 3.app/Contents/PlugIns/OTF.glyphsFileFormat/Contents/Resources/tx
Expected in: /usr/lib/libSystem.B.dylib
dyld: Symbol not found: ____chkstk_darwin
Referenced from: /Applications/Glyphs 3.app/Contents/PlugIns/OTF.glyphsFileFormat/Contents/Resources/tx
Expected in: /usr/lib/libSystem.B.dylib