UFO Export & Brace Layers

Hi, I am currently working on a project between Glyphs and Robofont. The Glyphs file has a good amount of brace layers that are exported to the UFOs, but I’m noticing that component-based glyphs in those layers are missing their base glyphs. Is there a way, on export, to make sure those components are there? Does that make sense?

For the time being I just wrote a script to fix this btw

Can you give me an example file and explains what is missing?