This has happened several times now in hardcore heritage Sebilis. A character dies during battle. Once NPC(s) killed, merc resurrects dead character. Character accepts res, selects Sebilis, and dies instantly before eve loading into zone, leaving behind a corpse. For some reason the merc does not acknowledge the new corpse, so have to campfire back and use expedient recovery.
After Posting this, I campfired back to camp, corpses for the 2 characters were gone. Expedient recovery seemed to return 20% to each of them.