Multiball is limited to max 3, this is not a bug but a design.
No lost ball is working, but you must never lose the ball. If you get triple ball and then lose one of the three balls you will not get ball bonus. Comet issue indeed is the bug and will be fixed in the next update. Thanks for report!
LucasBurgel: When you play tournament you must go from beginning to the end. You cannot end in the middle and later return. We will probably change that in the next update. Sorry for that!
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