Unknownreported this bug
Hello, looks like the pickupitem mechanic has a visual issue: https://www.youtube.com/watch?v=NEPwqdbEH18&feature=youtu.be
When trying to pickup stacked items, the items in the ground will get stuck (only visually, the real item will get in your inventory correctly), and the fake item will stay stuck in the ground, impossible to interact with
Tested it with just this line on a random sword:
- pickupitem @ItemsInRadius{r=10} ~onUse