BUG: PeriodIndex[B].to_timestamp inferring "D" instead of "B".
- [ ] closes #xxxx
- [x] tests added / passed
- [ ] 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

looks user facing? needs a note > looks user facing? needs a note

sure, will update. > > looks user facing? needs a note
> 
> sure, will update.

ping when ready ping hmm are these failures in master? > hmm are these failures in master?

yes.  i think #44381 handles all but one of them ok can you rebase just to check then. what is the one that is not handedl? > what is the one that is not handedl?

theres an sdist one that's failing in 52 seconds