Quoted from GravitaR:One GOTG Pro I play does the Ball to left outlane often, another one doesn't.
Bonus still carries over but in a different way now. Complete a mode or so and get an extra ball. Upon the extra ball the mode completion bonus carry's over if you don't tilt. I've tested this many times with just letting the EB drain and still get a massive bonus. The character related bonus's seem to zero out which is the weird part.
Code 1.01
I don’t think this a bug, you get the bonus for completing a mode with every ball after that not just the EB. I think this was done to encourage mode completion as in earlier versions a lot of people were only playing Groot MB and later just focusing on Orb.