DynamicMaterialTest C++ and Lua Functor Materials are not displayed properly

[LB-ArturZieba]

Describe the bug In Samples > RPI > DynamicMaterialTest the C++ Functor Material and Lua Functor Material are not displayed properly, showing only dark grey materials. While C++ Functor Material is not shown on the https://github.com/o3de/o3de-atom-sampleviewer/wiki/RPI-Samples#dynamicmaterialtest documentation page, the Lua Functor Material should have pulsating blue materials. It should be noted that changing the materials roughly match the average compile time, when compared to the table under the Metrics section on the documentation page.

This issue also occurs on Windows and on the development (ec385c71c5f853d64f22d4f0bdd23c570b8ffb44) branch.

This issue should be treated as Major priority.

Steps to reproduce

1. Launch AtomSampleViewer.Gamelauncher.
2. Open the Samples > RPI > DynamicMaterialTest sample.
3. Change the Default StandardPBR Material to C++ Functor Material and Lua Functor Material respectively, note the changes of the materials on shader balls.

Expected behavior All materials are displayed on the shader balls properly.

Actual behavior C++ Functor Material and Lua Functor Material are not displayed on the shader balls properly.

Video

https://github.com/o3de/o3de-atom-sampleviewer/assets/86952082/39254053-c88a-465e-ab1b-d4419ce36bf6

Found in Branch o3de: Stabilization/2310 (a2c1876) o3de-atom-sampleviewer: stabilization/2310 (893fbaf)

Desktop

• Device: PC
• OS: Linux
• Version: Ubuntu 22.04.3 LTS
• CPU AMD Ryzen 5 3600X 6-Core Processor
• GPU AMD Radeon RX 5700 XT
• Memory 16GB