Element Bounding Geometry Brep extracted from wall geometry with a negative offset below its host level incorrectly generated.

[ThomasMahon]

Describe the bug Element Bounding Geometry Brep extracted from wall geometry with a negative offset below its host level incorrectly generated. The wall has no top constraint.

To Reproduce Steps to reproduce the behaviour:

1. Create a wall in Revit (2019.2, latest version of RiR and R7 beta)
2. Give its base offset a negative value so it extends below the host level, e.g. -150.0
3. Ensure the top offset is 0.0 and the top constraint is Unconnected
4. Extract the geometry using RiR.

Expected behavior Brep should accurately represent the wall geometry.

Screenshots