As reported.
<Robot> Okay, it went in this order: I bought about 40 pumpkin bricks, then placed five of them, lit all five, two exploded, then placed two more, and lit them, for a total of five lit, not exploded pumpkin bricks. Then, I picked up the lit pumpkin bricks, and saw that in my inventory, I had both lit and unlit pumpkin bricks so i placed the five lit bricks, only to see the unlit bricks dissappear from my inventory i picked all five back up, and was back with two different kinds, but anytime i try to select the unlit bricks, i cannot.
<Grim> This bug possibly affects spikes/bloody spikes as well.