Implied Decal Blend Modes don't properly account for Material Attributes usage

I've attached a project with the necessary materials that demonstrate this issue. I would expect that just because a Set Material Attributes node is inside a material graph it wouldn't affect the decal blend mode of the material.

1. Create a new material, set its domain to Deferred Decal, and its Blend Mode to Translucent.
2. Check the "Use Material Attributes" checkbox
3. Create a Set Material Attributes node and expose the Normals and Opacity pins
4. Connect to the Normals pin this texture: Texture2D'/Engine/Functions/Engine_MaterialFunctions02/ExampleContent/Textures/newhplaneNormalsMap.newhplaneNormalsMap'
5. Connect a SphereMask to your opacity pin: 
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6. Create a new Set Material Attributes node that takes the Normals/Opacity Material Attributes as an input, and expose the Base Color pin. 
7. Create a new Vector Parameter named "Base Color" to the Base Color pin and set its value to 1.0, 0.0, 0.0, 0.0.
8. Connect the output of this Set Material Attributes to the Material Attributes input pin.
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9. Create a new child instance of your material and apply it to a new Decal Actor.
10. You should now see the decal affect the scene as expected.
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11. Duplicate your decal material, and in this one connect the Normal/Opacity Set Material Attributes to the output of the material. You should leave the Base Color Set Material Attributes node in the material but disconnected from the flow of the material.
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12. Create a new instance of your Normal/Opacity decal and apply it to a new decal actor.
13. You should now see the decal apply a black base color instead of using the underlying base color of the surface it's applied to.
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14. Finally, duplicate your Normal/Opacity decal material and delete the Base Color SMA from the graph. 
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15. Create a new instance of this base colorless material and apply it to a new decal actor, and observe the expected behavior. The decal modifies the normal of the underlying material without affecting the base color.
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