Decals affect materials even if Receive Decals = off

Repro:

1) Download the project https://github.com/iM0ve/Automotive

2) Open CarDemo Scene

3) Enable Bugs->Decal

 

Note: Im making updates to the project, so for the repro better to check out this exact commit from history:

https://github.com/iM0ve/Automotive/commit/1ee7ff480b6a491979c21f3d3bcaad8d8ebca998

 

Result: The cars material has Receive decails=off. But the decal still affects normal, smoothness, and emissive. Only the base color works as expected.

Expected: When Receive decals = off, the Decal object does not affect the hood in any way.

 

Edit: I was told that decal emissive is a limitation, nothing we can do about it. If thats true then the bug is only about Normal and Smoothness affecting the hood.