[BLOCKER] Cloning chests is mishandled which erases items

Build: 418100
Summary:
When cloning a chest next to another chest to create a double chest, the contents of one of the chests depending on the orientation is deleted or changed.
Impact:
This directly impacts Infinity Dungeon which relies on cloned chests as an upgrade system of sorts. In addition this is not expected behavior. The contents of the chests should remain the same and when creating the double chest it should include the contents of both chests, not just one.
Repro Steps:
1. Create 2 chests apart from each other.
2.Clone one of them next to the other one.
Observed Results: One of the chests will over-write contents of the other chest and/or change the items in some way
Expected Results: They should just include the contents of both chests in the single double chest gui.
Screenshots/Videos attached: https://youtu.be/zbbFZEJH96U
World also attached.