TST: Old Issues
- [x] closes #16710
- [x] closes #16719
- [x] closes #16867
- [x] closes #17091
- [x] closes #17286
- [x] closes #18549
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them

