Spawned AI only follows Blackboard route when instance synced

For my master’s degree assignment I am making a vehicle game in which enemies hunt a player. I have a waypoint in my world to use as their start point, and then they autonomously select new ones from the world to stay near the player.

This worked perfectly with a persistent instance until I tried to spawn a copy of this enemy vehicle into the world.
My problem is that I wish each vehicle to use its own waypoint choices but right now if I leave ‘Instance Synced’ in Blackboard unchecked, the spawned vehicle does nothing (as if not possessed even though it is).

When I check this box, both vehicles happily hunt me, albeit by the same waypoint.
Why is this the case?