The quest marker leads to a dead-drop icon, which I'd assume is meant to be on the side of the trashcan that should contain the quest items.
However, the icon is offset from the trashcan surface (so both the icon and the quest marker are floating some distance from the trashcan) and the trashcan itself is empty.
I've tried verifying the game files through steam, restarting the game, and reverting to a save-point from before I had taken the mission; but the bug still remains.