AutoGenerated PointGraph for NodeLinks not cleared previous generated data

Hello. I using multiple graphs on scene.
For comfort separate baking i quick write monoBehaviour with custom inspectoor, that scanning current graphs and show scanning buttons for every graph on scene. This script using NavGraph.Scan() method to scan concrete graph.

I have some NodeLinks between my graphs. When I scan one of the graphs, the data is only added to the PointGraph but not cleared before. Should I clean this data manually? If yes, how exactly?
add two sceenshots before and after.

Need to clear old data (red).

Also, when I delete this PointGrapph(with idex 1 in graphs list) I lose all graph data and I need to rescan it. This greatly slows down the work with graphs.

Current ver. 4.3.51