Random crash

[orangeagain]

Random crash on some meshs. In some cases,crush on program generated mesh.(generated by arkit). In this exampleMesh, xatlas crash on random loop. Is this problem cause by single chart? or angything? ExampleMesh.zip

public class TestAtlas : MonoBehaviour
{
    public Mesh targetMesh;
    Mesh meshCopy;
    uint count;

    void Start()
    {
        meshCopy = Instantiate(targetMesh);
    }

    void Update()
    {
        if (!xatlas.Unwrap(targetMesh, 0))
            Debug.LogError("error");
        count++;

        Debug.Log(count + "success");
    }
}