Conservative Rasterization.

From this video here, I learned that I can just turn on conservative rasterization to remove these artifacts.

As a reminder, there's no reason to download directly from this page, I highly recommend using the package manager.

You should simply be able to add https://github.com/naelstrof/SkinnedMeshDecals.git#upm to your package manager.

If that doesn't work, you should be able to add it to the manifest.json like so:

{
  "dependencies": {
    "com.naelstrof.skinnedmeshdecals": "https://github.com/naelstrof/SkinnedMeshDecals.git#upm",
  }
}