Aron Ganberg Astar - add nodes at runtime with pointgraph

hello i am making a game where the player move following the aron ganberg pointgraph pathfinding solution (http://arongranberg.com/astar/). the user click on an object, and the player is moving to it.

at various times, i instantiate new portions of the terrain and delete the old ones. those portions are prefab which contains a number of nodes (tagged nodes) which i want to set as a new pointgraph. is there any way i can do that?

i tried AstarPath.active.Scan() after spawning the new terrain but the scan only recognize the old nodes. Scanning is set so it takes all the gameobjects tagged "nodes".