Quest Complete music happens when another quest is completed during a scenario quest

I was doing the tutorial Quest scenario "Eliminating A Threat" when I found a Golden Ticket treasure. This completed my "Golden Ticket" quest, but even though the main quest in the scenario was not completed, the music still started up and lasted until it ended. (Side note, I never knew there was an end to that music...) It seems like that music should only play when the scenario's quest itself is completed, not some other side quest?