Brewing stand not using fuel

After the October update came out, I started my current world to try all the new stuff. My friend and co-player and I did all the usual stuff, then made our nether portal and went to beat up some blazes to take their rods. I made my brewing stand, then put 20 blaze powder in the fuel slot. One was pulled out to fill the fuel reservoir, and I set to brewing.

Since then, I have done a buttload of brewing. I made a single chest full of fire resist potions for when we went hunting for wither skeleton skulls, potions of water breathing and night vision for hunting squids so I could get ink for black dye ( why do we only get 6 slots for designs on banners, hm? I want to try designs that need many more! ), potions of regeneration and instant health.

There were 19 blaze powder in the fuel slot when i started, minus that first one that had been taken to fill the fuel reservoir. Now, three months later, there are still 19 blaze powder in the fuel slot. The fuel reservoir is empty. Apparently I only had to put in one blaze powder and I could use the brewing stand forever without needing any additional fuel. I don't think that was supposed to happen.