Is it actually rotated or does it just remember that that document is supposed to be rotated? In other words if you emailed it to me would it still be rotated when I opened it?
In other news, that's precisely why I'm weary to open PDFs in (edit: recent versions of) macOS because it autosaves, and I need to have a bit-perfect copy of said PDF. I mean, I open it in Firefox or Chrome, and this is just a problem that is specific to my circumstance, but it still bugs me.