Iskaaran Harpoon issue

When using the Iskaaran Harpoon on Lunkers, if someone goes into the water and kills it while your trying to bring it in, you get no loot, it appears the Iskaaran Harpoon is not considered tagging it. so basically you spend all this time fishing up the Ominous Conch and doing the Harpooning the way game was intended only to have people steal it from you. Please fix it to either not let them be killed in the water or make the Harpoon to actually tag it so we get loot from the Lunkers

Thank you