REGR: Behavior differs when adding Series to frame between matching and non matching index
follow up to #56426

this was inconsistent now for matching vs non-matching

cc @lukemanley 
This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. Looks like this PR has gone stale and needs a rebase. Closing to clear the queue but feel free to reopen if you have time to circle back