PR: Material Name - Generic Models not visible in IFC

### Enhancement Description

I didn't get the Material name of some Generic Models (precast Balconyplate) in the IFC-model.
In the custom Pset (ILS) is the material name Visible (4.7 Materiaal).

I have added the parameter 'IfcSingleMaterialOverride' for those element but it didn't work

Is there someone who had an option of make this correct?

### Revit Version

2025.4.x

### IFC for Revit Addon Version

25.4.40

### Windows Version

11 25H2

The report provides no source file, test, or entry point. Reproduce the export with Revit 2025.4.x, IFC for Revit 25.4.40, and a Generic Model using IfcSingleMaterialOverride, then inspect the resulting IFC and custom ILS property set. Done means the material name for the affected Generic Model appears in the IFC.

Written by the indexing model from the issue text.