Why are my walls and solid structural column invisible when clipped?

I have an FBX import from Revit which for reasons I can’t explain, refuses to display solid entities (walls, posts) that are being cut through in a plan view with a lowered clipping plane. I can’t figure this out as I have a entire town modeled in Revit and exported it to FBX and it works absolutely fine, but a new model created using the first one as a template will not show the walls. What the heck? Are solids a hidden texture that’s been overridden somewhere?

Materials needed to be set to double-sided, issue fixed.

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