Substrate Single Layer Water material fails to compile in blendable Gbuffer mode when using the Single Layer Water BSDF node

When using Substrate in Blendable GBuffer mode, a material with the single layer water BSDF node produces a shader compiler error :

MaterialEditorStats: Error: [SM6] Shader debug info dumped to: "\Saved\ShaderDebugInfo\PCD3D_SM6\NewMaterial_7d16ee4857da21e\Default\FLocalVertexFactory\TMaterialCHSFNoLightMapPolicy\0"

E:\Epic Games\UE_5.7\Engine\Shaders\Private\RayTracing\RayTracingMaterialHitShaders.usf(551,53): Shader TMaterialCHSFNoLightMapPolicy, Permutation 0, VF FLocalVertexFactory:

  /Engine/Private/RayTracing/RayTracingMaterialHitShaders.usf:551:53: error: use of undeclared identifier 'GetSingleLayerWaterMaterialOutput0'

        const float3 ScatteringCoeff = max(0.0f, DFDemote(GetSingleLayerWaterMaterialOutput0(MaterialParameters)));   

                                 ^

MaterialEditorStats: Error: [SM6] E:\Epic Games\UE_5.7\Engine\Shaders\Private\RayTracing\RayTracingMaterialHitShaders.usf(552,53): Shader TMaterialCHSFNoLightMapPolicy, Permutation 0, VF FLocalVertexFactory:

  /Engine/Private/RayTracing/RayTracingMaterialHitShaders.usf:552:53: error: use of undeclared identifier 'GetSingleLayerWaterMaterialOutput1'

        const float3 AbsorptionCoeff = max(0.0f, DFDemote(GetSingleLayerWaterMaterialOutput1(MaterialParameters)));   

                                 ^

MaterialEditorStats: Error: [SM6] E:\Epic Games\UE_5.7\Engine\Shaders\Private\RayTracing\RayTracingMaterialHitShaders.usf(553,39): Shader TMaterialCHSFNoLightMapPolicy, Permutation 0, VF FLocalVertexFactory:

  /Engine/Private/RayTracing/RayTracingMaterialHitShaders.usf:553:39: error: use of undeclared identifier 'GetSingleLayerWaterMaterialOutput2'

        const float PhaseG = clamp(DFDemote(GetSingleLayerWaterMaterialOutput2(MaterialParameters).x), -1.0f, 1.0f);

1. create a substrate material (blendable Gbuffer mode )
2. create a single layer water BSDF node and link it to front material

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1. Save the material

Expected

Shader compiles without errors

Actual

The shader compiler fails with errors