Question In URP DBuffer decal, can decals are drawn on top of the 5th and the subsequent terrain layers ?

Hi, I'm trying the Decal Renderer Feature in a terrain map.

My environment is the following.
・Unity 2021.3.6f1, URP 12.1.7.
・The technique setting of Decal is "DBuffer".
・A terrain object is assigned to "Terrain Lit Material".
・Terrain layers are like 1st:grass01, 2nd:grass02, 3rd:grass03, 4th:grass04, 5th:soil01, and so on.

I have a problem that decals are drawn under the 5th and the subsequent terrain layers, e.g. 5th:soil01.
Until the 4th terrain layers, decals are drawn on top of them, and it is just what I expected.

I hope in the case of the 5th and the subsequent terrain layers decals are drawn on top of them.
Do you know how to solve this problem?

 

Same problem.
https://forum.unity.com/threads/decals-on-terrain.1291346/

I try to use decals for the footprints, but I have no footprints on certain ground of Terrain.

 

I took a screenshot of Unity Frame Debugger.
DBuffer is not used in drawing for the 5th and the subsequent terrain layers.

In fact, in TerrainLitAdd.shader of drawing for the 5th and the subsequent terrain layers (see Case2 in the screenshot),
DBuffer keyword "#pragma multi_compile_fragment _ _DBUFFER_MRT1 _DBUFFER_MRT2 _DBUFFER_MRT3" is not declared.

Since I'm not a graphic programmer, I don't know why the use of DBuffer is not declared in TerrainLitAdd.shader.