Double copper chest may split when waxed with golem on top

The double copper chest will split when the golem is standing on top, and you wax the double chest.

Repro Steps:

1. Place an oxidized copper chest next to a double non-oxidized chest.

2. Allow or get the golem to get on the top of the double chest.

3. Wax the double chest.

Result:

The double chest splits, and the name of each chest is different. One is a chest, the other is a copper chest.

Expected Result:

No change to the double chest should occur, and it should become waxed.