Attached actor in Sequencer does not detach regardless of the detach state settings until Sequencer is restarted

Attached objects in sequencer do not detach with newly specified "When Finished" property until Sequencer is restarted. 

Tested in: 4.23.1 CL#9631420  4.25 CL#11062379

1. Place two objects into the scene.
2. Create a new Level Sequence 
3. In the level sequence, move object A to another location
4. Attach object B to object A at any point during transition. 
5. Set the object to detach before the end of the sequence, ie. frame 50.
6. Scrub to within the attach section time, ie. frame 25.
7. Set the attach section to Keep State.
8. Scrub outside the attach section time, ie. frame 75 (the object should still be attached)
9. Set the attach section to Restore State <-- this is the key. Whenever this is changed, it takes the CURRENT state as the value to restore
10. Scrub outside the attach section time, ie. frame 75.

Result: Object B will not detach 

Expected: The object detaches when prompted in the sequencer without having to restart sequencer.