PR: IFC export from elements inside an Revit Assembly not displaying correctly

### Problem Description

Hi everyone.
I have assembled one instance of a Revit window and several door instances. The assembly itself is not exported to IFC, but the elements "living" inside the assembly are.
I noticed that the geometry in IFC is misplaced once I started doing some clash controls and these misplaced objects clashed with other objects.

Please take a look to the following image. On the right side in red are the IfcDoor elements and in green the IfcWindow object. It looks like the IfcWindow is mirrored when exported to IFC

Ifc exporter version 25.4.3.0

### Revit Version

2025.4.x

### IFC for Revit Addon Version

25.4.0

### Windows Version

10 22H2

Start by reproducing the reported IFC export of Revit elements inside an assembly using Revit 2025.4.x, IFC for Revit 25.4.0, and exporter 25.4.3.0. Compare the exported window and doors with their Revit positions, focusing on the reported mirroring and misplaced geometry. Done means the assembly contents appear in the correct orientation and location for clash checking.

Written by the indexing model from the issue text.