MovieSceneSequenceExtensions::AddSpawnableFromInstance no longer adds a spawnable correctly

1. In python, 
   seq = unreal.load_asset('/Game/NewLevelSequence1')
   asset = unreal.load_asset('/Game/MigratedContent/BoxAnim/BoxAnimTest')
   seq.add_spawnable_from_instance(asset)
2. Open level sequence

EXPECTED: There should be a valid spawnable

[UE-23848] Bug Status

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