When a mesh with the relevant shader applied exists, an Imposter is generated with extremely unnatural holes in itself and the surrounding meshes. Since this shader is typically intended for application to Body meshes, it causes Imposters where most of the body is broken.

Wataameya's BlackBody Shader: https://booth.pm/ja/items/3698935

Reproduce Avatar (A private avatar with only a BlackBody Shader applied to its body mesh): https://vrchat.com/home/avatar/avtr_333a94d5-c11f-40ed-939a-085a8d84da2d