Issue description:

After I leave my Digital Miner from a far place from my base, It will disapear

Steps to reproduce:

1. place and activate a WayStone near by ut spawn then place the Digital Miner as far as you can
2. Fully Upgraded it [Includes Speed, Energy and Anchor] and fully power it then let's it run
3. Place the WayStone nearby it then go back to your spawn WayStone
4. Exit the entier Minecraft game then log back to the game then load ur world, go back to ur miner and see it disappear

Mods / Forge Versions : [ All in 1.16.1]

Forge: : 1.16.1 - 32.0.108
Mekanism: 1.16.1 - 10.0.9.432
Other relevant version:
All mekanism add-on are version 10.0.9.432

WayStone mod: 1.16.1-7.1.1
AzureDoom Chunk Loader: 1.16.1-1.0.1
Xaeo's Minimap: 20.20.1_Forge_1.16.1

Could you please provide your latest log, I am somewhat curious to see if maybe one of the other mods you have is causing a vanilla bug that spams the log about chunks failing to save because if so it would be because the chunk you put the digital miner in never ended up saving.

https://pastebin.com/CBXhNfpQ
here is your latest.log file

ok because I have a mod for chunk loading
with ID is 'chunk'

Well I was correct that something is causing the chunks to not save:

[14:19:02] [Server thread/ERROR]: Failed to save chunk -289,358
java.lang.NullPointerException: null
	at net.minecraft.world.chunk.storage.ChunkSerializer.func_222649_a(ChunkSerializer.java:421) ~[?:?]

but I am not quite sure what it is due to, but my suspicion is that it is not related to Mekanism.