Neutralizing state variable has no effect

[See this notebook](https://colab.research.google.com/drive/18gu80gydLhwPYPrPNgxjJWGteNXunSpL)

Neutralizing federal variables and parametric state reforms both work, so I suspect it's a caching issue

Start by running the linked Colab notebook and compare the neutralizing state-variable case with the federal-variable and parametric-state reform cases. Trace the caching behavior involved in those examples; done means neutralizing the state variable changes the resulting policy calculation as expected.

Written by the indexing model from the issue text.