[Bug]: quick plot broken for observer class

[BradyPlanden]

Python Version

3.12

Describe the bug

It appears that changes since v24.12 have caused the plot to break for the model output when uses an observer class. I suspect this is due to the current shape returned from the observer.evaluate() method.

Steps to reproduce the behaviour

Run unscented_kalman_filter.py example script. The model is not plotted alongside the target.

Relevant log output