Dark Artifacts Appear On Meshes With "Use As Occluder" After Enabling DBuffer Decals

Objects set to "us as occluder" will create dark artifacts from certain view angles. For this to occur "DBuffer Decals" need to be enabled in the project settings.

The licensee has noted that adding a constant pixel depth offset to the applied material fixed the issue. Also, unchecking "us as occluder" gets rid of the artifacts as well.

1. Open attached project
2. Navigate your camera over to the wall that is labeled as "affected wall"
3. Look at the wall at various viewing angles preferably from a lower position so that you are looking up at the wall.

RESULT
The wall will begin to flicker with dark artifacts

EXPECTED
The wall's appearance remains consistent through all the various viewing angles.

Polygons that share the same position, but flipped normal on one have artifacts.