This is not normally a problem (eg lava bucket is unstackable->only one at a time, coalblock is expected to be consumed) but using a stackable fuel source that returns an item (eg empty glass bottle) causes the formspec to bug out a bit and the "returned" item is not returned anywhere
This is not normally a problem (eg lava bucket is unstackable->only one at a time, coalblock is expected to be consumed) but using a stackable fuel source that returns an item (eg empty glass bottle) causes the formspec to bug out a bit and the "returned" item is not returned anywhere