Losing buckets when baking cakes

Losing buckets when baking cakes

What I expected to happen was...:
I thought the buckets should be saved after baking a cake, because its very expensive to lose 3 buckets every cake! Don't you save the buckets in the PC? Thats what i remember at least..?

What actually happened was...:
I got My cakes but lost 3 buckets.

Steps to Reproduce:
1 egg 3 wheat 2 sugar+ 3 buckets of milk =Cake