First note, the (?) in the title is for uncertainty. Earlier tonight I had a player (Physics_Breaker) make a pig spawner for me, with my materials as I don't have the recipe unlocked currently. I dropped everything (4 compressed iron, 4 hardened obsidian, 1 nether star) and he said he only got 1 compressed iron out of the 4 he picked up. I went back and grabbed 3 more compressed iron and threw them one by one to assure he would get them and this time it worked. Unsure if this is a known issue or a bug at all, maybe I just got bamboozled. Regardless, I figured I would toss this up here.