Hello,
just as the title says, the Old_Sparse eyebrows from the Beard and Brow Builder package crash CC3 when trying to export for Unreal.

Repro:
- Open CC3 with default.
- Add Old_Sparse Eyebrows
- Export FBX -> select Unreal, export with default settings.
- Progress bar will get to ~30% and then crash.

Thank you sir, I would never have found that thread.  These are crash inducing... hope these get some priority soon.