## About The Pull Request
Fixes#72943Fixes#62901
This fixes specifically icebox multi-z ruins not spawning with their
counterpart below ruins because the area for the underground portion of
icebox was not whitelisted so there were no valid spawn positions.
## Why It's Good For The Game
Multi-z icebox ruins working is good.
## Changelog
🆑
fix: Multi-z Icebox ruins including the Demonic Frost Miner can now be
placed again
/🆑
---------
Co-authored-by: Changelogs <action@github.com>