Finer Grind bug

I’m doing tour 2: Bag of tricks and am up to the Finer Grind mission where you need to grind the bird poo and perform a 5-0 grind. I removed all bird poo but it only counted 5/12. Yes I’ve removed it from the bench and the longer grind.

if I fast travel away, untrack the mission and reload the game the poo reappears but when I grind over it it doesn’t disappear until I move a certain distance away. Getting frustrated as I want to progress the missions.

Please help get it sorted.