Two copper chests with different rust levels can create a large chest

If you place 2 chests with different rust levels, they can create a large chests

Steps to reproduce:

1. Put a normal copper chest

2. Put a oxidized copper chest next to the other chest

Expected results:

Chests can’t create a large chest if they have different rust levels (Normal, Exposed, Weathered or Oxidized)

Obtained results:

Chests can create a large chest even they have different rust levels