Third Party Camera View updates not displayed

The documentation provides function calls for [adding](https://ai2thor.allenai.org/ithor/documentation/environment-state/#sub-add-third-party-camera) and [updating](https://ai2thor.allenai.org/ithor/documentation/environment-state/#sub-update-third-party-camera) third party cameras for displaying alternate views of AI2-THOR scenes.

However, on usage of those, by invoking corresponding function in test script, [`test_unity.py`](https://github.com/allenai/ai2thor/blob/main/ai2thor/tests/test_unity.py) as follows:
```
test_update_third_party_camera(_fifo_controller)
```
does not appear to produce any visible change of camera view in the Unity interface.

Please provide an example or advise how to ensure third party camera view updates are displayed.