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I see this entry in the short list:

# BHV SPELL Globals Global enchantments of nations that have vanished stay in effect. [Edi's note: Presumably in cases where nation is defeated without the casting unit explicitly being killed (e.g. dominion death)]

I think this bug may be different:

In the World in Crisis MP game, TC had an immortal unit cast Arcane Nexus. That unit was killed in melee combat, in positive dominion. But TC's capitol was owned by another nation, so the immortal unit was permanently killed. However, the Arcane Nexus is still up.