In Glyphs3, the VariableFontPreview plugin shows how you want it to be in the font.
But it doesn’t work correctly in the browser and Illustrator.
Can you please tell me where is the error?
Files: KAZKA – Google Drive
I think I found where the error was.
At least I managed to make the font work by editing * GX.TTF in Fonlab7.
In the TagGlyph field, you need to remove .varAlt0:
I have fixed it. Thanks for the test file.