Creating "Level Sequence with Shot" with spawnable cameras creates duplicate cameras

This is not a regression as it does occur in //UE5/Release-5.1 @ CL 23901901

Repro Rate: 3/3 times

1. Create a blank project
2. Click the Level Sequence dropdown > Add Level Sequence with Shots
3. Double click into one of the shots on the timeline
4. Move the camera cut over

Expected Result: The camera cut will move and be the only cut on the timeline

Actual Result: A shorter camera cut is duplicated behind the main camera cut

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