HDRP LayerLitShader "Opacity as density" as a not expected blending effect in threshold transition.

Steps to reproduce:

1. Create a HDRP projet. Tested on 6.4, but should be on every version.
2. Inport the package add to the Jira.
3. Create a scene and add the PlanneWithVertexColor.prefab from the package.

Actual results: In the threshold transition a blending effect appears.

Expected results: Opacity as Density mode use the diffuse alpha channel as a threshold to render or not the pixels (diffuse rgb). There is no blending effect with the bottom layer.

Reproducible with versions: 6.4 or any

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): Windows

Notes:

• Certainly a bug present from the implementation of the feature.