As can be seen in this tree: https://github.com/Bukkit/CraftBukkit-Bleeding/tree/md_5/bottleFix A vanilla bug that has been troubling many of you for a while now, is fixed thanks to the commits above. This bug was where a glass bottle, filled in a cauldron would not show up in your inventory until the place where it should be is clicked. The bug can be viewed below. https://bukkit.atlassian.net/browse/BUKKIT-325
