Data like Camera Tracks can get corrupted inside Level Sequences when Undoing some operations

Camera trucks can get in a invalid state when you undo certain operations. One example would be undoing a camera set that has been added to a camera track. When you undo that operation, other cameras get invalidated.

1- Open a project in version 5.6.
2- Add two cine camera actors to a level
3- Create and open a Level Sequence
4- Add a camera truck. Click the + icon and add one of the cameras added to the level. Dont modify the Time of the timeline.
5- Click again the + icon, select New Binding and add the other camera.
6- Undo the operation and you will see that the camera linked to the camera track will be lost.