[Help!] Static Batching seems not to work with DepthNormals Texture (Unity 2019.3.3f1)

[Problem Description]
I'm developing a scene with approximately 400 static objects, and most of them shares the same material, so in normal drawing stages, only 17 draw calls are needed, thanks to static batching.

However, when I added an post-processing effect which requires the _CameraDepthNormalsTexture to be rendered, no static batching is applied during the _CameraDepthNormalsTexture rendering stages.

Is there's something wrong with my configuration? or does unity not support Static Batching with shader replacement technique? Why?

Thanks a lot!

[Developing Environment]
Unity 2019.3.3f1
macOS 10.15.4 with Metal
Forward Rendering path