Get Original Geometry of Revit System Family. Such as wall, floor

Hi all users in this forum.
I want to extract original geometries of Revit elements before joins, cut etc. are applied… With loadable family instances like beam or column, i can solve by use API method Familyinstance.GetOriginalGeometry() . But when i worked with Revit system family instances like floor or wall, this method did not work.

Do you know how to deal with this problem? Please see a below picture to understand what i mean.
I also would like to attach my Revit and Dynamo files?
Thank you!

GetOriginalGeometryFloor.dyn (4.8 KB)
Structural Model Sample_Foundation.rvt (1.8 MB)

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