How to preserve transparency of parts added to a view

Mods TechDraw
1

I have a window assembly where the glass panels are made transparent by setting the Object style > Transparency property to 85, which works as expected in the 3D view.

However, when I add that view to a TechDraw page, the transparency value seems to be ignored and the glass appears as opaque:
Captura de pantalla de 2024-01-10 12-59-54.png
Is there a way to preserve the transparency value when adding a view to a TechDraw page? Thanks.

File to reproduce

OS: Ubuntu Core 22 (ubuntu:GNOME/ubuntu-xorg)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.35524 (Git) Snap 889
Build type: Release
Branch: main
Hash: 59fdebd7e7443364ff9ec4b8d31e8e0d09ad90e2
Python 3.10.12, Qt 5.15.10, Coin 4.0.0, Vtk 7.1.1, OCC 7.7.1
Installed mods: 
  * BIM 2021.12.0
  * ExplodedAssembly
  * Assembly4 0.50.6
2

For the sake of completion, this is now reported as issue 11988.

3

I’m not sure that the source object’s transparency setting is going to help you.

You have to remember that TechDraw generally produces hidden line drawings, not photorealistic
renderings.

Even if a given face is rendered as a transparent area, you won’t see anything behind it
unless you have asked for hidden lines to be shown.
Exploded_transparency_hiddenLines.png
If you need to reproduce the 3d window as shown, you can look into ActiveView.
Exploded_transparency_ActiveView.png