Expected Behavior

When one Chest that's a part of a double Chest, the other one should keep its contents.

Actual Behavior

When one Chest that's a part of a double Chest gets moved, the other one loses its contents.

Steps to Reproduce

1. Put 2 Chests together
2. Put items in them to they both have something
3. Move one of them
4. The other one will now be empty

Version of Minecraft, Carry On, Forge

1.12.2
1.11 (it does not happen on previous versions)
14.23.5.2768

Screenshots encouraged

Ouch, that's a bad one. Releasing hotfix later.

Hotfix is out (as soon as curse approves it)