Revit component family form - no longer working?

Hi Benjamin, a quick test here is OK.

Rhino.Inside Revit: 1.19.8753.16429 (2023-12-19T09:07:38)

Rhino: 7.37.24004.15001 (Rhino 7)
Revit: 2024.0 (24.0.4.427)