Link: Lighting is not working well when the choice is "Two Side"

Is there an existing issue for this?

• I have searched the existing issues

Problem description

Enum, nested with the Link Lighting, is messing up the expected result.

Doesn't matter the value I put on Lighting, it does not change the result if I keep the nested Enum as it is.

To obtain the expected result, I have to set Lighting to Two side, but I also have to remove the One side from the beginning of the Enum.

This enum here:

A better example was posted here:

• https://github.com/FreeCAD/FreeCAD/issues/20776#issuecomment-3001575890

Full version info

OS: Ubuntu 25.04 (ubuntu:GNOME/ubuntu-xorg/xcb)
Architecture: x86_64
Version: 1.1.0dev.42180 (Git)
Build date: 2025/06/16 16:25:59
Build type: Release
Branch: main
Hash: fca41e4003f1680cf604b593a046ac2b1db6ba8a
Python 3.11.13, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.2.5, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: English/United States (en_US)
Navigation Style/Orbit Style/Rotation Mode: Touchpad/Trackball/Drag at cursor
Stylesheet/Theme/QtStyle: OpenDark.qss/OpenDark/
Logical DPI/Physical DPI/Pixel Ratio: 96/94.0767/1
Installed mods: 
  * Cables 0.2.0
  * Assembly4 0.50.19-dev
  * sheetmetal 0.7.22
  * DynamicData 2.74.0
  * Curves 0.6.63
  * InventorLoader 1.5.1
  * diff-tools 0.1.0
  * ose-piping
  * OpenTheme 2025.5.20
  * fasteners 0.5.38
  * osh-autodoc-workbench 0.2.3
  * OpticsWorkbench 1.2.2
  * lattice2 1.0.0

Subproject(s) affected?

Core

Anything else?

No response

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