Regression: External owned Spawnable object disappears when the sequencer movie is finished.

Regression: external owned spawned actors stays in 4.25 & 4.25 plus

but it is removed from 4.26P5, 4.26P6, 4.26P7

1) Create a new level sequencer

2) Add a new actor (i.e. cube) into the scene

3) Make track with the actor in the level sequencer

4) Set the actor spawnable

5) Set the actor owned external (spawned object owner > External)

6) Play the sequencer PIE

Expected: the actor stays when the movie is finished.

Result: the actor is removed.

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