NavmeshPrefab scan can't update the tagvalue

General Recast graph
1

Hi,
I used the A* pathfinding project version 5.1.4, and i split the large world with navmeshPrefab using RecastGraph.
I could’t update the tag value from navmeshPrefab scan, however, scan from AStarPath could update the tag value, which i set in recactMeshObj.
Is there something wrong with my operation? How can i fix it?
Thank you!