Actually it should continue working without any changes like before. Basically if you leave item or bits on 1 or 0, it'll be 1 item per 1 bit. Otherwise it'll calculate the amount of items required for the bits you entered or vice versa. So you can have for example 10 items per 5 bits.
So update: IT worked just fine when people did single bits of 100. Then multiple people at once did 100 bits and somehow it skyrocketed to like 3000+ objects. I don't know how! Funny as hell but not the intention lol
Fairly sure its stacking the amount of items for each redeem and multiplying it by huge amount cause you're modifying the number of items in the reward when you throw them.