Vertex Index disorder when reading from obj file

### 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](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### Describe the issue

Vertex Index disorder when reading from obj file
When reading obj files, the first 10 vertex indices will go wrong. Please help solve this issue.

Current method: trimesh library is used to import mesh, and then transfer to open3d. XD

### Steps to reproduce the bug

```python
realTimeMeshVerArray = np.asarray(realtimeMesh.vertices)
for i in range(0,9):
print(f"{i} pos: {realTimeMeshVerArray[i,0]} {realTimeMeshVerArray[i,1]} {realTimeMeshVerArray[i,2]}")

#when I compare realTimeMeshVerArray with obj file (open with notepad++), it is different XD
```

### Error message

_No response_

### Expected behavior

_No response_

### Open3D, Python and System information

```markdown
- Operating system: Windows 10 64-bit
- Python version: Python 3.9.7
- Open3D version: 0.15.1
- System architecture: arm64
- Is this a remote workstation?: no
- How did you install Open3D?: pip
```

### Additional information

_No response_