While testing AI behaviors on the small GGC-Poznan map, I've observed how at least two Polish AI ground units on Seek & Destroy actually aimed for one German river-marked flag. One TKS defended this river-flag until scenario end wasting combat potential.
That showed nicely that it's not necessarily the supply points what drives AI units on but also minor flags. River info-flags on impassable terrain should fix such misbehavior. I guess it all depends how close such pointless flags are to the AI compared to