How to remove an artefact in results of geometry subtraction based on CSGMesh

Questions
,
#1

Anybody know how to remove this artefact? I mean the sphere, it shouldn’t be there after this operation. But it is. Sometimes it works fine, especially for simple models, but on complex models it causes such effect.

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  const group = new THREE.Group();
  const sphere = createSphere(80);
  const glb = await loadModel('models/out.glb');
  const object3D = glb.children[0];
  setSize(object3D);
  const resultObject3D = subtractObject(object3D, sphere);
  group.add(resultObject3D);
  return group;

I use this approach from CSGMesh.js lib to cut models:

const subtractAFromB = (meshA, meshB) => {
  const csgA = CSG.fromMesh(meshA);
  const csgB = CSG.fromMesh(meshB);
  const resultCSG = csgA.subtract(csgB);
  return CSG.toMesh(resultCSG, meshA.matrix);
};
#2

Can you please describe in more detail on which artifacts are you referring?

#3

The sphere. It shouldn’t be there.