Question SRP batcher with a custom CBUFFER？

(Unity 2019.4.31)
I have some uniform need to update per frame.
For example:

Code (CSharp):

1.             CBUFFER_START(PerFrameUpdate)// 36 bytes
2.             half4 _OutlineColor;
3.             .....
4.             CBUFFER_END
5.  
6.             CBUFFER_START(UnityPerMaterial) // 76 bytes
7.             float4 _MainTex_TexelSize;
8.             ....
9.             CBUFFER_END
10.  

I remove _OutlineColor from shader "Properties" in order to make the shader SRP Batcher compatible,and try update the _OutlineColor in these ways，but none of them work properly.

Code (CSharp):

1.  
2. // When srp batch some objects, they share the same _OutlineColor value (first update value)
3. void Update()
4. {
5.                 Visual.GetComponent<Renderer().sharedMaterial.SetColor("_OutlineColor", Outline);
6. }

Code (CSharp):

1.  
2. // Same problem they share the same _OutlineColor value.
3. NativeArray<float> tmp = new NativeArray<float>(9, Allocator.Temp);
4. tmp[0] = Outline.r;
5. tmp[1] = Outline.g;
6. tmp[2] = Outline.b;
7. tmp[3] = Outline.a;
8. tmp[4] = 0;
9. tmp[5] = 0;
10. tmp[6] = 0;
11. tmp[7] = 0;
12. tmp[7] = 0;
13.  
14. ComputeBuffer cbuffer = new ComputeBuffer(1, 36, ComputeBufferType.Constant, ComputeBufferMode.Immutable);
15. cbuffer.SetData(tmp);
16. Visual.GetComponent<Renderer>().sharedMaterial.SetConstantBuffer("OtherColors", cbuffer, 0, 36);
17. tmp.Dispose();

My Questions：

• I have several group properties used in diffirent shader varient. they will update per frame and may exist same time. Do I need to separate them from UnityPerMaterial cbuffer?
• If I use custom cbuffer with SRP batcher，how can i update them properly?

 

In 2020.3.33f1 SetConstantBuffer Worked ,but break SRP Batcher. I wonder why the batcher can't just add a command like "PSSetConstantBuffers". i just change a cbuffer isn't it?

 

Bump - same question for 2021.3.3f1, though in my case I create a shader variable in a ShaderGraph Custom Function node cginc, and the batcher changes the values arbitrarily (possibly depending on mesh render order).