External reference error when trying to save Level Sequence Actor

External reference error when trying to save Level Sequence Actor after a change has been made. The error given is "Can't save ../../../.././../Users/YourUserName/Documents/Unreal Projects/YourProjectName/Content/NewMap.umap: Graph is linked to private object(s) in external package."

1. Download the attached project
2. Open the attached project
3. Save the level
4. Add the "CutScenePlayer" to the level
5. Open "CutScenePlayer" player blueprint
6. Move the construction script node around (in the construction script)
7. Compile and save the blueprint
8. Close the "CutScenePlayer" blueprint
9. Try to save the level using the "Save Current" button at the top right next to the source control button (do not use "Save all")
10. Notice that the error "Can't save ../../../.././../Users/YourUserName/Documents/Unreal Projects/YourProjectName/Content/NewMap.umap: Graph is linked to private object(s) in external package."

Expected: The project would save changes to the current level
Result: The level cannot be saved

"Graph is linked to private object" Blueprint inherit LevelSequenceActor