Issue

[Shadergen tool|https://doc.qt.io/qt-6/qtquick3d-tool-shadergen.html] doesn't eliminate "Generate Shader" step in launch.

"Generate Shader" step is found here: 

https://doc.qt.io/qtcreator/creator-qml-performance-monitor.html#analyzing-qt-quick-3d-events

In the sample project, robot arm sample, was used to reproduce the issue.

The repository is here: https://git.qt.io/mikio_hirai/shadergentest#

Qt Quick 3D is used in these files in this project:

1. https://git.qt.io/mikio_hirai/shadergentest/-/blob/master/content/MainScreen.ui.qml?ref_type=heads
2. https://git.qt.io/mikio_hirai/shadergentest/-/blob/master/content/RoboticArm.ui.qml?ref_type=heads

content/CMakeLists.txt has qt6_add_materials(), like so: https://git.qt.io/mikio_hirai/shadergentest/-/blob/master/content/CMakeLists.txt?ref_type=heads#L5

this generated resources like so:

https://git.qt.io/mikio_hirai/shadergentest/-/tree/master/build/Desktop_Qt_6_8_3_MinGW_64_bit-Debug/content/.rcc?ref_type=heads

However, when the app is run, it still seems to go through "Generate Shader" step in launch.
*Generate Shader is taking longer because of log output caused by QT_RHI_SHADER_DEBUG=1.

You can see the console output with the attached log.txt.