r.Shaders.Optimize=0 crashes when compiling a UI material

[2024.08.30-22.12.22:384][ 73]LogWindows: Error: appError called: Assertion failed: CurrentGPUVirtualAddress != 0 [Link Removed] [Line: 659]

Disabling shader optimisation can crash the editor when compiling or saving a User Interface material.

This seems related to fixes that landed in 5.4.3, but those fixes appear to not fully correct the issue for UI materials.

From the UDN (I don't think this is the proper fix, but it does provide more context):

With some preporting of RHI error diagnostics that will be in UE5.5, I was able to glean that the problematic shader was a UI material shader, which was missing a Primitive UB that the pixel shader was expecting. I verified that setting r.Shaders.Optimize=1 did not crash, and that adding the following lines to FSlateMaterialShaderPS::SetParameters also prevents the crash when shaders are unoptimized:

auto& PrimitivePS = GetUniformBufferParameter<FPrimitiveUniformShaderParameters>();
SetUniformBufferParameter(BatchedParameters, PrimitivePS, GIdentityPrimitiveUniformBuffer);

Modified from the licensee's steps:
1. To Config/DefaultEngine.ini, add r.Shaders.Optimize=0
2. Launch the editor
3. Create a new material and open it in the material editor
4. Change the Material Domain from "Surface" to "User Interface"

[UE-23848] Bug Status

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