Bug VFX cannot build completely

Hi, I encountered a problem with VFX 7.1.8(unity version 2020.3.4f1).

In normal case the ,vfx file will be like

it contains some shader files. I think that means this vfx file compiles shader successfully.
My project should build a resource package before building an executable file. I call the function Build in VFXGraph.cs for building VFX files.

However, after build process, I can't see any particle effect in game scene and when I open Unity Editor the vfx file looks like

not contains any shader.
But, if I click button at menu
in this way the vfx file build correctly.
please give me an answer if you have any idea. Thanks in advance