Variable font export

On trying to export a variable font, I get

These glyphs are not compatible: eight.c2sc
Can't convert to compatible TrueType curves.

The two masters do seem compatible:

  • all green in View > Show Master Compatibility
  • exporting to single interpolated instances works
  • preview window shows successful interpolation.

Glyphs 3.0.4 (3095)

The second line in more important. IT seems to fail to convert it to TrueType. The most problems come from inflections, even very slight ones can cause problems.

Can you send me that file?