EditMode(MeshEditing): Faces deleted or flipped revert to original when relaunching editor

Faces deleted or flipped with Static Mesh Viewer EditMode revert to original when relaunching editor.

Datasmith Beta Version 1.0 (as listed in plugins viewer)

With Datasmith Plugin active:

1. Import a datasmith file
2. Open a Static Mesh in Static Mesh Editor
3. Activate EditMode
4. Delete or Flip some faces.
5. Save the static mesh
6. Save All changes
7. Restart Editor
8. Open the Static Mesh you edited in the Static Mesh Editor

Result
Changes are not saved.