When you tab out of the game while a cinematic sequencer is running with audio playing through it, the audio track will restart once you tab back into the game. (Tab out or press ESC and then close the menu and it restarts).
Proof:
When you tab out of the game while a cinematic sequencer is running with audio playing through it, the audio track will restart once you tab back into the game. (Tab out or press ESC and then close the menu and it restarts).
Proof: