Steps to reproduce:

1. Load clothed Camila
2. Export to FBX with Blender profile (other profiles probably the same) as Mesh only.
3. Import FBX back to CC
4. Brows are gone from Scene manages as well as face morphs for Brows, Tear-Line and Eye Occlusion.

Note: Even if there are no Brows, Tear-Line and Eye Occlusion are still losing face morphs.

There are ways to reinstate, but it's too cryptic and takes extra time: https://forum.reallusion.com/FindPost518675.aspx