Glyphs with open paths are empty at export in last update.

Hi everyone. I’m designing fonts with open paths in Glyphs. Since the latest update to 3.5 from 2.x?, when I export the files as OTF , the characters that have open paths appear empty. Has anyone else experienced this? I’d love to know if there’s a fix or if I’m missing an export setting.

I’d like to mention I have a small application where I can write a block of text with these fonts. The app automatically opens the paths, and I can then export it as SVG for use in any design software, laser engraving/pen plotting in my case: Single line font tester

Paths closed:

Paths opened:

The app converts text into paths with opentype.js and, in the monoline workflow, ignores closing commands (Z) when rebuilding the geometry.
This way, each glyph is treated as an open path and drawn only with stroke, even if the last point happens to coincide with the first.

Right now, the use of single-line or monoline fonts is increasingly common, with more people using them for applications like laser engraving and various drawing plotters, such as AxiDraw or Cricut, etc.

In fact, using these monoline fonts as they are now generated in OTF is no problem at all. You only need to open the paths, and I think it’s quite straightforward. I wonder why many design applications don’t incorporate this into their tools.