Reg->6.6X: Qt3D: Light color and intensity doesn't work at all

Bug moved over from PySide. Steps to reproduce:

• Apply attached qtbug121531_repro.diff to Qt3D Repo (patching simple-cpp example)
• Compare 6.2.4 to later versions

Recently, me and my teammate rewrote a PySide2 Qt3D project to PySide6 version which took a lot of effort.

I know the latest version is 6.6.1, but in 6.6.1 version our custom Qt3DCore.QBuffer and Qt3DCore.QAttribute architecture gets broken without any clues or warnings.

We tested all combinations from Python compatibility matrix, limiting ourselves to Pythons: 3.8.2, 3.10.11, 3.11.6, 3.12.1.

Only 3.10.11 and 3.8.2 displays the render properly.

We choose Python 3.10.11 and we checked all PySide6 versions: 6.0.x - 6.6.1

All 6.0.0 - 6.2.4 display the render properly, but light does not work.

All 6.3.2 - 6.6.1 creates issues with our custom architecture mentioned earlier. Too much time spent on it, so we need to postpone it.

We want to move forward with 6.2.4 (or earlier PySide6) and Python 3.10.11.

By "light does not work" I mean like in the title of this issue: light color, and intensity parameters do not work at all, possibly other parameters as well.

Please see minimal reproducible example: simple3d.py

Running my example in Python 3.12 + PySide 6.6.1 gives effect:

Running my example in Python 3.10.11 + PySide 6.2.4 gives effect: