Wrong type of copper blocks in trial chambers atrium

The stairs in the atrium are made of the wrong type of copper blocks. They are normal copper blocks and not a waxed variant.

Steps to Reproduce

1. Create a new world, use this seed and coordinates.
   -4669042830805504273
   -448.26 -22.45 1478.71
2. Check the unoxidized copper blocks.

Observed Result
The copper blocks aren't waxed, causing them to get oxidized over time.

Expected Result
The copper blocks should be waxed.