Why are my walls invisible when clipped through in plan view on this imported fbx from Revit?

I’ve imported it into another project and they are still invisible while the other project displays properly. It must be something wrong with this particular fbx export…I can’t figure it out. The Revit files are really no different in their construction.

Really simple: Need to set materials to be double-sided because Twinmotion works in surfaces, not solid geometry like Revit. Another question I had to answer myself…thanks community!

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