DFAO artefacts created by landscape painted invisible in cooked builds

Looks like the issue stems from the DistanceFieldBentNormalAO pass

Download + launch the licensee repro from here - [Link Removed]

Licensee also described the repro steps, but I was unable to generate the error by duplicating this, however hopefully it gives more insight into where the issue is coming from:

• enable "Generate Mesh Distance Fields" in project settings.

• create an empty level.

• insert a directional light source, make it dynamic.

• insert a skylight, make it dynamic and assign a cubemap source.

• insert a configuration of 4 static meshes boxes forming a floor, walls and a roof.

• insert a landscape through the middle of the static meshes.

• assign a material to the landscape that uses the "Landscape Visibility Mask" connected to the Opacity Mask in a "Blend Mode=Masked" material.

• paint the landscape invisible inside the static mesh configuration.

• observe that there are no artifacts in editor (top part of image).

• package the project (i.e. cook the level for windows) and run the cooked game binary - observe artifacts on the walls of the static mesh configuration (bottom part of image).

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