Rare Monster icons persist after killing rare monsters in Maps

Hi all, have been having an issue recently in maps where rare monster icons on the mini-map will persist after the monster has been killed. Some monster icons will disappear on death, but some will remain, even once the map is completed.

Rare monster icons will remain on the mini-map, even after the map has been cleared.

Fyi/Best.

it happens a lot to me also but i can make it go away by exploding the corpse.