The Bug:

Double chests have incorrect block states after upgrading old worlds.

Steps to Reproduce:

• Launch an instance of 1.11.2.
• Place down two chests next to one another in order to create a double chest.
• Exit the world and upgrade it into the latest snapshot.
• Look at the block states of the chests.
• Take note as to whether or not double chests have incorrect block states after upgrading old worlds.

Observed Behavior:

Double chests have incorrect block states after upgrading old worlds.

Expected Behavior:

Double chests would retain their block states after upgrading old worlds.