SOLVED - $ionicActionSheet does not remove backdrop after hide

Solution: don’t mix angular-animate 1.3 with ionic beta13

It seems like after I choose an entry from my action sheet or cancel it by clicking on the backdrop, the backdrop becomes fully transparent, but does not disappear because the div with the class ‘action-sheet-backdrop’ does not get removed.
This is in beta13, from an app built with ionic creator.