Bukkit/CraftBukkit — pull request #538 by Moo0 (2011-11-21 18:41:15+00:00)
Title: Fix for "Attempted to place a tile entity..." bug.

This fixes the "Attempted to place a tile entity" bug that was introduced in 1.8. It happens every time a furnace starts or stops burning, and possibly at other times.
it was a result of using "in-chunk" coords (i and k) rather than "world" coords (l1 and i2). This meant it was always trying to create the tile entity at 0-15,y,0-15 rather than the correct coordinates, wiping any tile entity that happened to be there, as well as possible other effects. As it is there in vanilla it was probably just a typo by Mojang.