Shader compile error after enabling LumenRef in UE6 main

Exploring the new LumenRef mode in UE6 main.

After compiling the source without errors the editor launches fine without errors.
However after enabling LumenRef by entering the following in DefaultEngine.ini
r.LumenRef.supported=True

and launching again I get 6 shader compile errors!

My question is
Is it possible that my compile process is still wrong or is it most likely the repo source code is wrong?

\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(98,40): Shader FLumenRefInitialSamplingRGS, Permutation 2, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:98:40: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.GeometryNormal = Material.GBufferData.WorldNormal;
~~~~~~~~ ^
\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(99,37): Shader FLumenRefInitialSamplingRGS, Permutation 2, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:99:37: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.GBufferData = Material.GBufferData;
~~~~~~~~ ^
\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(100,39): Shader FLumenRefInitialSamplingRGS, Permutation 2, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:100:39: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.PathRoughness = Material.GBufferData.Roughness;
~~~~~~~~ ^
\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(100,40): Shader FLumenRefInitialSamplingRGS, Permutation 8, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:100:40: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.GeometryNormal = Material.GBufferData.WorldNormal;
~~~~~~~~ ^
\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(101,37): Shader FLumenRefInitialSamplingRGS, Permutation 8, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:101:37: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.GBufferData = Material.GBufferData;
~~~~~~~~ ^
\Engine\Shaders\Private\LumenRef\LumenRefInitialSampling.usf(102,39): Shader FLumenRefInitialSamplingRGS, Permutation 8, VF None:
/Engine/Private/LumenRef/LumenRefInitialSampling.usf:102:39: error: no member named ‘GBufferData’ in ‘FLumenMaterialData’
PathState.PathRoughness = Material.GBufferData.Roughness;

Also after an attempt at manually correcting If I use
r.LumenRef.Visualize 1 in the Cmd console what I see is

Geometry Normals look correct
World Cache Base Color appears solid yellow
World Cache Lighting appears solid yellow

This makes me think the shaders are not working properly