Build failing: AttributeError: '_process_plot_var_args' object has no attribute 'prop_cycler'

/Users/lpsinger/src/userguide/analysis/index.rst:32: WARNING: Exception occurred in plotting index-1
 from /Users/lpsinger/src/userguide/analysis/index.rst:
Traceback (most recent call last):
  File "/Users/lpsinger/Library/Python/3.11/lib/python/site-packages/matplotlib/sphinxext/plot_directive.py", line 552, in _run_code
    exec(code, ns)
  File "<string>", line 44, in <module>
AttributeError: '_process_plot_var_args' object has no attribute 'prop_cycler'

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