Using lots of redstone stuff, the hotbar and controls disappear and the chests become invisible.
Here somes screenshots.
The green screen is when i opened the chest.
When I go in the world the chunk discharges immediately.
I can screen thousands of times to get the original because I enter my world coffers including animals disappear after two seconds.
In this screenshot you can see where the chests before and is in the other when the coffers were missing was after.
Minecraft pocket edition 0.14.0 build 3