Navigation mesh is generated ignoring collision for ISM added by construction script

When opening a map with ISM in place, NavOctree is not updated because the ISM bounds are assumed invalid and the geometry is not taken into account in the navmesh build.  The following log output is generated at this time. 

LogNavigation: Warning: FNavigationOctree::AddNode: Empty bounds, ignoring InstancedStaticMeshComponent /Game/Developers/Collections/ism_cs_nav_test.ism_cs_nav_test:PersistentLevel.BP_ISM_C_1.NODE_AddInstancedStaticMeshComponent-0. LogNavigation: Warning: FNavigationOctree::AddNode: Empty bounds, ignoring InstancedStaticMeshComponent /Game/Developers/Collections/ism_cs_nav_test.ism_cs_nav_test:PersistentLevel.BP_ISM_C_1.NODE_AddInstancedStaticMeshComponent-0. 

Manually changing the ISM location or updating the bounces will eliminate this problem. Also, if this map is set as the startup map when the editor is launched, the problem does not occur. This is most likely a regression in UE5.5.

1. Open the attached project
2. Open "ism_cs_nav_test" map
3. Navmesh build by selecting "Build Paths" in the editor
   Result: 
   Collisions are not taken into account around the mesh built with ISM 
   Expected: 
   Navmesh is generated taking ISM collisions into account