Enderchest, furnace and cauldron duplication

This appears to only work on my Realms (Windows 10), but basically breaking the furnace and the cauldron will duplicate them. Breaking the enderchest will give you 8 obsidian and the enderchest back. All items broken with enchanted pickaxe with silk touch. My friend tried it out on our realm on his Xbox and it worked on that as well. Attached pictures demonstrating issue. So far these are the only items that I have found that duplicate.