OS: Windows 10 x64
Browser: ungoogled-chromium 108.0.5359.95
Open the inspector and expend the materials.
The colorShader and colorShaderOccQuery should be excluded from serialization and not being loaded again.
Referring to BABYLON.ShaderMaterial#doNotSerialize
The colorShader and colorShaderOccQuery is serialized and loaded, and never reused again.