Whenever AI ground vehicles run into the plantations (or whatever they are) they start pathfinding in a maze like pattern, the same weird pattern they use when in a city, but much tighter since they pathfind past every single plant, or at least that's what it looks like. They can stay in a patch of plants/trees for multiple minutes before they find their way out, and if it's a big enough plantation they might never find their way out.
The vehicles in the video is set on a straight path to a single waypoint, but they run into this behavior whenever they are in the types of plantations that are in the video. All three vehicles are in the same group and were driving in formation until... well... this.