The finale.partners=crystal property is missing, but only causing some minor issues.
The real problem is there is a bug with the finale position being already taken by Crystal and so it never renders. I'll track it down and fix it.
In the meantime, you can still get the finale composite to show properly by picking Rosie before Crystal when selecting your players.
Or if you're feeling real industrious you can move the finale from Rosie to Crystal which should circumvent the "there's already someone else there" problem.