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Issue description:

Server crashes and produces following in console before crashing: https://gist.github.com/fcpwiz/4afbd26872a02810fd26eb7ebab7aeea

Chunks can't be loaded off of the main thread.

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

Forge: 2705 (1.12.2)
Mekanism: 1.12.2-9.4.13.349
Other relevant version: SpongeForge: 2705-7.1.0-BETA-3235

Checks around this code point were changed slightly recently. Please re-test on a recent release and comment if it still happens

That method is guarded by a block that checks if the chunk is loaded by

if(tileEntity.getWorld().getChunkProvider().getLoadedChunk(x >> 4, z >> 4) == null)
{
	continue;
}

If its unloading in that time there is nothing we can do, and if sponge is screwing with that not being null, that's their problem.

Exactly the same crash on MEKANISM-1.12.2-9.8.3.390 + Forge 14.23.5.2847 @thiakil
Line 68 for us:
mekanism.common.content.miner.ThreadMinerSearch.run(ThreadMinerSearch.java:68)

@thiakil
Same crash, but Line 63. Version 1.12.2-9.8.3.390
mekanism.common.content.miner.ThreadMinerSearch.run(ThreadMinerSearch.java:63)