Breaking ender chest with silk touch pickaxe drops both chest and 8 obsidian blocks

Breaking an Ender Chest with a Silk Touch I enchanted Pickaxe will yield the original Ender Chest plus eight (8) blocks of Obsidian. This bug is exploitable as the player can continue to "place" then "mine" the ender chest for an endless supply of obsidian.

PS.

This duplication bug also works with jukeboxes, as a jukebox will break into 2 jukeboxes when mined with a Silk Touch I axe.