So I won three consecutive games on platinum and proceeded to mess up by pressing "Ok" instead of "Spin all". *facepalm*
But when I then started a new game, the three charges were
already lit on the opponent briefing screen. So I thought "Hey, maybe the spin didn't go to waste after all." But after winning the game I didn't get the extra spin after the normal ones, even though all the charges were lit. Same story with the fifth game. Apparently I had to lose a game first to clear the charges.
Here's a picture after the third spin:
![](http://i.imgur.com/pKcdF.png)
I can confirm the bug has been fixed... just tried it on bronze. You now get the extra spin whenever you spin all and have all charges.