fixed issue, multiindex dataframe now created as expected
- [ ] closes #50456
- [ ] https://github.com/pandas-dev/pandas/blob/46c8da3e5b987154d2e0a44562c71be635ae826a/pandas/tests/io/json/test_pandas.py#L336 now passes
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added an entry in the latest `doc/source/whatsnew/v2.2.0.rst` file if fixing a bug or adding a new feature.

Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen.