The issue is that the premium list cache is configured to persist for 60
minutes. So after updating the list, checks/creates for up to the next 60
minutes could still be referring to the old list. That's fine and dandy, unless
you delete the old premium list immediately (*bad*), which makes all domains
appear to now be non-premium for as long as the cache lasts. The reason deleting
the premium list entries makes names appear as non-premium is that a load-by-key
existence check with the domain label itself is used to determine if a name is
premium.
I also removed a misleading cache update statement, which doesn't do what it
appears to be doing (it appears to fix this issue) because cache is
instance-level, and so even if the premium list were updated from the frontend
instance only one of 100 instances would have its cache updated. But it's
updated from the tools service anyway, so it's guaranteed to not be a shared
cache with any instance serving EPP traffic.
On a sidenote, I introduced this bug on 2014-10-27 in [] The domain
label list refactor was my Noogler project.
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