It happenned to me many times already that a random NPC spawned out right in front of me while I entered a new area, more even when getting inside a "restricted zone" ... Which is hindering any kind of mission... it is really annoying. NPC should not be able to just pop out from nowhere around you for a random reason. Teleportation doesn't exist yet in Elite, because otherwise we would not need to land any station, or even use an elevator to go from a landing plateform to the bar... Please fix this with a simple rule, no "new random spawn" under a 200m radius.
What I want to know is which of these tw experiences you are having:
1. The NPC literally appears out of nowhere directly in front of your view. Unmistakably ‘appearing from nowhere’ in a spot there was no NPC.
2. You have cleared a base of enemies and stumble across more unexpectedly or additional enemies show up out of nowhere on your radar but appear while not in your line of sight and the settlement is in an alarmed state.
If scenario 2 is what you are experiencing I can tell you there are several hidden security doors all over settlements where additional guards deploy from. I’ve seen them open in front of me before unexpectedly and nearly got wiped because of 6 elites coming out of a small structure that I had no idea housed additional guards.
As such you could kill everyone on the base and trigger the alarm on the last npc before you kill them and suddenly an entire swarm of guards could release on you out of nowhere.
I think these places extra guards deploy from are treated like elevators to subterranean portions of the facility. Don tinfoil now.