Glyphs 4 and named stylistic sets

I just compared a VF exported by Glyphs 3 to one from Glyphs 4 (using the same source file).

I did a quick side-by-side comparison in https://wakamaifondue.com/ and the only difference I could spot is that the font generated by Glyphs 4 does not seems to write the names for the stylistic sets (at least not in a way that wakamaifondue can read).

Is this a known problem?

I cannot reproduce the issue; both Glyphs 3 and Glyphs 4 export fonts where the stylistic set name appears on the site.

I just checked with TTX and the names are not in the file at all.

Could you send me a sample file in a private message?