BUG: shape issue when concatenating different datetime resolution (#55374)
- [ ] closes #55374 & #55067
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests)
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/v2.1.2.rst` file if fixing a bug or adding a new feature.

#53641 is the correct approach for this Thanks for the PR, but since it appears https://github.com/pandas-dev/pandas/pull/53641 is already addressing this issue closing in favor of that issue