Level sequence becomes dirtied when opening other level sequences if the level sequence contains a track with a spawnable actor

Steps to Reproduce
  1. Open Editor
  2. Create a new actor blueprint
  3. Add the actor to the scene
  4. Create a new level sequence (Cinematics button > Add level sequence)
  5. Create an actor track in sequencer ([+Track] button > Actor to sequencer > Select the actor that was created)
  6. Right click actor track > Convert to spawnable
  7. Save the sequencer
  8. Close level sequencer tab
  9. Create a new level sequence

Result: The first level sequencer will now become dirty (and will do so whenever another sequence is opened)
Expected: The Level sequence would only become dirtied when a change is made

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ComponentAnim - Sequencer
Affects Versions4.16.2
Target Fix4.20
Fix Commit3967141
Main Commit4044405
Release Commit4095966
CreatedJul 25, 2017
ResolvedMar 27, 2018
UpdatedMay 31, 2018