Copy/paste or Duplicate a spawnable doesn't work

1. Create a level sequence
2. Drag a cube into the sequence
3. Right click on the cube in the sequencer tree view and choose 'Duplicate'
4. Save
5. Quit and restart

EXPECTED: There's a duplicate spawned cube with the duplicated tracks.

RESULT: The duplicate spawned cube doesn't have any tracks.

Duplicating spawnables in sequencer removes them