BUG: DataFrame(ndarray[dt64], dtype=object)
- [ ] closes #xxxx
- [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
- [x] whatsnew entry

does this need a release note. maybe open a issue too. yeah not even sure what its' actually fixing :-> whatsnew added + green