If the NPC is a merchant, they will not leave a corpse either (class 41). May also be true for adventure merchants, GMs, and other odd non-player classes.
You can adjust the value in the rule_values table for the rule "NPC:EmptyNPCCorpseDecayTimeMS". Adjust it to however long you'd like empty corpses to stay around. A value of 5000 would leave them for 5 seconds (as it's measured in milliseconds).
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