Multiline highlight chart not working with altair 5.2.0

[b-batton-sw]

The multiline highlight chart from the example section is not working with altair 5.2.0
https://altair-viz.github.io/gallery/multiline_highlight.html

Javascript Error: Cannot read properties of undefined (reading 'length') This usually means there's a typo in your chart specification. See the javascript console for the full traceback.

Im trying to plot it inside of a jupyter notebook using a python 3.9.10. kernel
Altair version:

name : altair
version : 5.2.0
description : Vega-Altair: A declarative statistical visualization library for Python.

dependencies

• jinja2 *
• jsonschema >=3.0
• numpy *
• packaging *
• pandas >=0.25
• toolz *
• typing-extensions >=4.0.1