Decal keywords change.

com.unity.render-pipelines.high-definition/HDRP/Material/TerrainLit/TerrainLit.shader

         _MainTex("Albedo", 2D) = "white" {}
         _Color("Color", Color) = (1,1,1,1)
 
-        [ToggleUI] _SupportDBuffer("Support DBuffer", Float) = 1.0
+        [ToggleUI] _SupportDecals("Support Decals", Float) = 1.0
     }
 
     HLSLINCLUDE
     //#pragma shader_feature _ _LAYER_MAPPING_PLANAR2 _LAYER_MAPPING_TRIPLANAR2
     //#pragma shader_feature _ _LAYER_MAPPING_PLANAR3 _LAYER_MAPPING_TRIPLANAR3
 
-    #pragma shader_feature _DISABLE_DBUFFER
+    #pragma shader_feature _DISABLE_DECALS
 
     //enable GPU instancing support
     #pragma multi_compile_instancing

com.unity.render-pipelines.high-definition/HDRP/Material/TerrainLit/TerrainLitData.hlsl

     surfaceData.specularOcclusion = 1.0;
 #endif
 
-#ifndef _DISABLE_DBUFFER
+#if HAVE_DECALS
     float alpha = 1;
     AddDecalContribution(posInput, surfaceData, alpha);
 #endif

com.unity.render-pipelines.high-definition/HDRP/Material/TerrainLit/TerrainLitData_Basemap.hlsl

     else
         surfaceData.specularOcclusion = 1.0f;
 
-#ifndef _DISABLE_DBUFFER
+#if HAVE_DECALS
     float alpha = 1;
     AddDecalContribution(posInput, surfaceData, alpha);
 #endif

com.unity.render-pipelines.high-definition/HDRP/Material/TerrainLit/TerrainLit_Basemap.shader

         _MainTex("Albedo", 2D) = "white" {}
         _Color("Color", Color) = (1,1,1,1)
 
-        [ToggleUI] _SupportDBuffer("Support DBuffer", Float) = 1.0
+        [ToggleUI] _SupportDecals("Support Decals", Float) = 1.0
     }
 
     HLSLINCLUDE
 
-    #pragma shader_feature _DISABLE_DBUFFER
+    #pragma shader_feature _DISABLE_DECALS
     #pragma shader_feature _TERRAIN_INSTANCED_PERPIXEL_NORMAL
 
     //enable GPU instancing support

com.unity.render-pipelines.high-definition/HDRP/RenderPipelineResources/DefaultHDTerrainMaterial.mat

   serializedVersion: 6
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
   m_Name: DefaultHDTerrainMaterial
   m_Shader: {fileID: 4800000, guid: eb607f5e8fc16e140b732f33d26c8c31, type: 3}
   m_ShaderKeywords: _TERRAIN_INSTANCED_PERPIXEL_NORMAL
         m_Offset: {x: 0, y: 0}
     m_Floats:
     - _CullMode: 2
+    - _EnableHeightBlend: 0
-    - _LayerBlendMode: 0
-    - _SupportDBuffer: 1
+    - _SupportDecals: 1
     - _ZTestDepthEqualForOpaque: 3
     - _ZTestGBuffer: 4
     - _ZWrite: 1