I checked the c++ code and it basically boils down to calling
CollisionComponent->SetCanEverAffectNavigation(bCanAffectNavigationGeneration);
So at this time, i’m not sure. Maybe a restart could help. But setting it to dynamic, should allow you to do what i show in the video. If that doesn’t work, then your nav mesh generation has problems. That can be solved by deleting RecastNavMesh-Default, restarting and rebuilding the navigation