I load and using Navmesh Graph files at run time.
However, if there is an object with the component of NavMeshCut on the stage, the offset data of the loaded NavmeshGraph will be cleared.
If you attach Mesh to Source Mesh of Navmesh Graph from the beginning with AstarPath Inspector, the problem will not occur.
I confirmed that this problem occurred in versions 4.2.2 and 4.2.5.
Thank you for the awesome asset