fix: NPCs disappearing when targets enter different map instances #2798
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When a player aggros an NPC and then enters a different map instance (dungeon, dies, etc.), the NPC would attempt to reset and chase an unreachable target. This caused NPCs to become stuck in a reset loop or disappear from their spawn map entirely.
The fix clears the NPC's target and aggro center immediately when the target switches to a different MapInstanceId, preventing the NPC from attempting to path to or reset towards an unreachable location.
(Hopefully) Fixes #2769