Warning getValue assumes leaf node after Poisson Reconstruction, Spyder

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](https://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](https://www.open3d.org/docs/release/) and the [latest documentation](https://www.open3d.org/docs/latest/) (for `main` branch).

### Describe the issue

Hi,
i get a ton of warning issues that spam my command window in Spyder after Poisson reconstruction, so that I do not see any other output:

Setting the open3D verbosity level to error did not change anything. I also tried the latest o3d version as suggested, still the same warning. I append the object so that you can try it yourself. This is a screenshot in Windows, but it happens identicially in Ubuntu.

### Steps to reproduce the bug

```python
import open3d as o3d

filename = r'C_16_f486.obj'
mesh = o3d.io.read_triangle_mesh(filename)
depth = 3
npoints = 10000
tpln = 10

pcd = mesh.sample_points_poisson_disk(number_of_points=npoints)
pcd.estimate_normals(search_param=o3d.geometry.KDTreeSearchParamKNN(20))
pcd.orient_normals_consistent_tangent_plane(tpln)
mesh_poisson, densities = o3d.geometry.TriangleMesh.create_from_point_cloud_poisson(pcd, depth=depth)
```

### Open3D, Python and System information

```markdown
- Operating system: Windows 11 64-bit/ Ubuntu 22.04
- Python version: Python 3.8.10
- IDE: Spyder 5.4.3
- Open3D version: 0.18.0
- System architecture: x86
- Is this a remote workstation?: no
- How did you install Open3D?: pip
```

### Additional information

[C_16_f486.zip](https://github.com/user-attachments/files/18004990/C_16_f486.zip)