Navmesh does not update when undoing the scaling of Navmesh Bounds Volume

REGRESSION: Yes, does not occur in 4.17.2

Navmesh does not automatically update when the user undoes the scaling of a nav mesh bounds volume.

This issue occurs with both changing the scale in the Transform settings, and with changing the extents of the brush.

1. Create and open a top-down blueprint project.
2. Press P to show the nav mesh
3. Select the NavigationMeshBoundsVolume in the level.
4. Resize the volume (either using the transform - scale setting or the Brush extents.
5. Undo.

RESULT

Navmesh does not update automatically

WORKAROUND

Rebuild paths in the level.