My experience: discard 1:1 previews feature is broken, again (it was broken for a while, then fixed for a while, now seems broken again).
Or, maybe they just changed how it works (cleaning up only upon restart) - dunno.
I know smart previews are only cleaned up upon restart (if > 1 hour has elapsed), but I thought regular 1:1 previews were immediate, they used to be anyway..
