Difference in Results Between Session and Private Version During Editing

I would like to know the difference in behavior when playing a sequence in a test play between “Session” and “Private Version” during editing.

I implemented a system where the sequence would play again after exiting and restarting the game. In a Session, the sequence played correctly upon restarting.

However, in a Private Version, even after leaving the map and restarting the game, the sequence did not play again.

What causes this difference in test play results? If anyone knows, I would appreciate your insight!