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Lately when I have been raising animals just out of the breeding barn, I have been feeding them baby bottles using the 'feed all' button. But it seems like once every 4 or 5 times, my bottle inventory will disappear, but the animal will show as not having been fed a single bottle!
For example, I start out with a horse as 5/7. I feed 5. I check the horse, and its bar now says 0/7!
It is too difficult to get baby bottles to be wasting them like this!