When you have an empty bucket it shows up as fuel for the furnace.
To reproduce
Get an empty bucket
Get a furnace
Open the furnace UI
Tap the fuel slot
The bucket shows as a possible fuel.
I would expect only Lava buckets to show up as fuel.
Update : This is probably WAI due to wet sponges being added
Attachments
Comments 3
Empty bucket can be placed in the fuel slot to obtain water when drying a sponge. I suspect that is why.
Wow