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Issue description:

Mobs can spawn inside the multi-block boiler, has no impact on function, just looks incongruous given that it's > 3K degrees in there

Steps to reproduce:

1. Build Big Boiler
2. Hang around near it.

Version (make sure you are on the latest version before reporting):

Forge: 34.1.42
Mekanism: 10.0.17.444
Other relevant version: MC 1.16.3

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

Mekanism: 10.0.17.444
Frontend:

Backend: