BUG: Change of behavior in casting of datetime-like types in MultiIndex
- [x] closes #43091
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [x] whatsnew entry

Added try-except block in multi.py to reset the behaviour back to 1.2.5