Raiders stand still outside until player come near them

As I already said in the summary part, all the raiders (including Ravagers) stand still after they spawned outside of the village. and then move when player come near them or attack them, and that make player a lot harder to deal with vindicators since they move toward players when we come near them and make it easier for them to attack us based on their running speed, down here is an attachment that prove it (don't mind the death of me, just focus on the buggy part).