Minecraft wiki entry for Ender_Chest, associated text: Because an ender chest's particles exist in a 1 block radius around the chest, the particles from a chest placed next to a wall are not seen on the other side.
Unlike chests, changes to an ender chest's name are not reflected in its inventory GUI.
Unlike chests, when broken, it does not drop the items inside it, due to the fact that the items aren't only in that chest.
Ender chests render as a full block when in the inventory, but not when held or placed.‌[Bedrock Edition only][8]
Ender chests cannot be locked by NBT tags.
The texture of ender chests does not change during Christmas in contrast to trapped chests and normal chests.‌[Java Edition only]
Mining an ender chest with a wooden pickaxe takes the longest time in the game (16.9 seconds) to mine a block with the correct tool, without the effect of Mining Fatigue and other mining speed reduction events.