It sounds like this might be related to the fact that the despawn timer does not pause while a mob is engaged in combat. How long was he alive before he despawned?
Example (p99 wiki):
https://wiki.project1999.com/Coldain_Ring_Quests
Quote:
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While you are killing the kodiak, Boridain will attack any nearby orcs, but this does not reset his despawn timer. So, once the orc is killed, Boridain is likely to immediately despawn.
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I don't know if this behavior is classic.