BUG: construct_1d_ndarray_preserving_na with dt64/td64 and object dtype
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

does this surface to user facing? > does this surface to user facing?

not AFAICT.  same as the maybe_convert_objects PR, this surfaces when trying to simplify our casting code