Description:
Chests with NBT data attach gotten with CTRL+Middle Click become bugged when placed next to each other. They aren't able to combine into a double chest and stay separate. The chest on the left plays the opening animation regardless of what chest is opened, and you aren't able to remove items from either chest. The effect is only temporary, they combine into a double chest upon relogging.

Steps to Reproduce:

1. Place a chest and put some items in it
2. Use CTRL+Middle Click to get a chest with NBT data
3. Place 2 chests, identical or not, next to each other

Observed Results:
Chests make a bugged amalgam of each other, not quite chest not quite double chest 

Expected Results:
Chests combine into double chest or stay separate.

Screenshot of Issue: