Silk Touch Enchantment causes duplicate drops

The bug

When breaking specific blocks using an item enchanted with Silk touch, they will drop extra items.

Affected blocks (list might be incomplete):

• Ender Chest (8 obsidian blocks + ender chest)
• Noteblock (2)
• Jukebox (2)
• Dispenser (2)
• Dropper (2)
• Observer (2)
• Daylight Sensor (2)
• Cauldron (2)
• Banner (2)