I was messing around with the Key of the King's Law, and a spider killed me while I was holding the Key and generating weapons (Also interesting is that the death message was "Chronoman17 was blown up by Spider", ). When I respawned, the weapons had not despawned, and were stuck where they were, still making noise. Even charging and releasing another set of weapons with the Key didn't affect them. I relogged, and the weapons were gone. The game rule keepInventory was true during this entire event, and it occurred while playing on the Forgecraft modpack in Single Player as made available on Curse.

FML Log: https://gist.github.com/anonymous/143c71a0dfab9bc674c8