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Issue description:

Crash / ConcurrentModificationException

Steps to reproduce:

1. Unknown

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

Forge: forge-1.12.2-14.23.5.2847-universal.jar
Mekanism: Mekanism-1.12.2-9.8.2.389.jar
Other relevant version:

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

https://gist.github.com/clienthax/71bbd305aa686fdb8a7424af9b837d6e

I have a feeling this was linked to the miner thread, as I havn't seen this again since patching that.

FrequencyManager is completely separate though

FrequencyManager is completely separate though

If the chunk with the TE calling the manager is loaded async it would explain the CME, i havn't hit this error once since the PR i submitted was setup on my server.