Affects Version/s: Snapshot 13w06a
Fix Version/s: None
Environment:java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.5) (6b24-1.11.5-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
Linux 3.2.0-37-generic #58-Ubuntu SMP Thu Jan 24 15:28:10 UTC 2013 GNU/Linux
Whenever a hopper puts something into the top slot of a furnace, the fuel disappears.
Edit: I didn't mean to post this... Is there a way to delete it?
Anyway, I found out this doesn't always happen - once it happens it happens reliably, every time. But if you replace the furnace, there's a good chance everything will work fine.