Aliases Behave Inappropriately With Hierarchy

I ran into a bug, here’s what it looks like from my end:
If I have a page titled “United States” which is aliased to “US”, and a page “United States/California”, if I type a link somewhere to “US/California” this will create a new page but doesn’t end up going to the same page as “United States/California”, and doesn’t appear in the hierarchy list at the bottom of the United States page.