VectorField not properly instantiated?

In [_2024/holograms/diffraction.py](https://github.com/3b1b/videos/blob/master/_2024/holograms/diffraction.py), there is an instance of VectorField that is missing the coordinate_system argument on line 400:
```
linear_field = VectorField(field_func, sample_points=wave_line.get_points()[::4], max_vect_len=2.0)
```

Is this an error or is the code supposed to run normally?

Error message:
```
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
Cell In[3], line 7
4 result[:, 1] = wave_amp_tracker.get_value() * wave.wave_func(points)
5 return result
----> 7 linear_field = VectorField(field_func, sample_points=wave_line.get_points()[::4], max_vect_len=2.0)
wave_line =
8 linear_field.always.update_vectors()
9 linear_field.set_stroke(WHITE, width=1.5, opacity=0.75)

TypeError: VectorField.__init__() missing 1 required positional argument: 'coordinate_system'
```