I've been trying to make a simple AI group flee carelessly for their lives without stopping even if they get shot at. Unfortunately, you cannot do that unless you separate every AI from the group.
Please, read the steps to reproduce and get back here later.
Those problems only happen when you're working with a group. If you, instead, place an individual unit and repeat those steps, they will run to your waypoint and stop for nothing.
Why do I think it should be fixed? I always wanted to make an AI squad flee away from battle if a certain condition is met; but it is very tough for them to run away succesfully if they keep on going prone and stuff like that. {F19735}