Read pointcloud from bytes unknown format error

### 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

Reading a pointcloud from bytes gives an error, reading the exact same pointcloud from file produces a valid pointcloud.

### Steps to reproduce the bug

```python
import io

import open3d as o3d

file_path = "./test.ply"

# Read ply from disk
pcd = o3d.io.read_point_cloud(file_path)
print(pcd.has_points())

# Read ply from disk and store in file_bytes
with open(file_path, "rb") as f:
file_bytes = f.read()

pcd_from_memory = o3d.io.read_point_cloud_from_bytes(file_bytes)
print(len(file_bytes))
print(pcd_from_memory.has_points())

```

The output of the code for any of my valid PLY files is always the same:
>>> True
>>> [Open3D WARNING] Read geometry::PointCloud failed: unknown format for (format: auto).
>>> 88073771
False
```

### Error message

[Open3D WARNING] Read geometry::PointCloud failed: unknown format for (format: auto).

### Expected behavior

I would expect a valid pointcloud to be loaded in from memory as well, but for now I am stuck writing a temporary .ply file and read it from disk.

### Open3D, Python and System information

```markdown
- Operating system: Ubuntu 22.04
- Python version: 3.11.9 | packaged by conda-forge | (main, Apr 19 2024, 18:36:13) [GCC 12.3.0]
- Open3D version: 0.18.0+e86fcb3
- System architecture: x86
- Is this a remote workstation?: no
- How did you install Open3D?: pip
```

### Additional information

_No response_