Part: Crash when creating a refined copy

### Problem description

In the attached file, there's a crash when trying to create a refined copy of one of the objects.

### Workbench affected?

Part

### Steps to reproduce

1. Open the attached file: [Refined.FCStd.zip](https://github.com/user-attachments/files/27251922/Refined.FCStd.zip)
2. Select "workpiece001 (Solid)"
3. Part --> Copy --> Refine Shape

### Expected behavior

no crash

### Actual behavior

crash

### Development version About Info (in Safe Mode)

```shell
OS: Windows 11 build 26200
Architecture: x86_64
Version: 1.2.0dev.20260429 (Git shallow)
Build date: 2026/04/29 07:07:16
Build type: Release
Branch: grafted,grafted
Hash: a785d40ac4c37f559b0b82fbaf9bf7dc68a468e4
Python 3.11.15, Qt 6.8.3, Coin 4.0.8, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: Polish/Poland (pl_PL) [ OS: Polish/Poland (pl_PL) ]
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Light/
Navigation Style/Orbit Style/Rotation Mode: Blender/Rounded Arcball/Window center
Logical DPI/Physical DPI/Pixel Ratio: 96/81.5973/1
```

### Last known good version (optional)

```shell

```