I'm noticing that taking on courier missions causes NPCs to spawn around me when I drop into a system. Some want me to follow their wake; others interdict me and go after my cargo, as they make clear on the comm, even though I'm not carrying any. As unrealistic as it is in general for NPCs to magically be alerted when you're on a mission, it makes even less sense for them to somehow know that you're on such a mission with no cargo, yet go after your cargo anyway. Could this be an oversight?