Put the summary of the bug you're having here

What I expected to happen was...:
My world to run better looking

What actually happened was...:
it duped the item

Steps to Reproduce:
1. place a chest and press escape 
2. then change biome blend and render distance to the max and leave the world
3. rejoin and put your items in the chest then my game crashed (I think that's what caused it) so I reloaded it and it duped