Background NPC cleanup
The game occasionally checks if NPCs or other AI controlled characters are stuck, lost in the void, or otherwise glitching and either removes them from the game or restores them to somewhat working order.
Alternate name: Background NPC fixing
The first video game about Background NPC cleanup was released on October 2011.
Trendy Entertainment has published all these games
This is not the same as unloading NPCs completely that go too far away or resetting everyone when revisiting an area.