Hi it happened twice on my server that when i leave the location of my Digital Miner (the nether in this one) it just disappear once i left it even if i have placed a chunk loader im using the latest version of mekanism please help me

Did you use the chunckloader upgrade or a seperate chunckloader ? I had the same issue. I added the chunckloader upgrade and it did not disappear anymore

I've also had this happen to me on 300. Hasn't recurred since I added the anchor upgrade, but the original disappearance is definitely a bug.

Duplicate of #3718

Hello! We're experiencing the same bug. Two things to add which may help lead to a solution:

1. We were able to reproduce the bug while running Mekanism ONLY, eliminating the possibility that it's a cross-mod bug.
2. We got it on video. https://youtu.be/BEy24f7ChxI

I will open a new Issue, as this one has been closed.