Please use the search functionality before reporting an issue. Also take a look at the closed issues!

Issue description:

I started in a new 1.16.1 world, and I'm at the point of checking out the nether with a jet pack. After returning from the nether, I noticed that my jet pack was still in my electrolytic separator as well as on my person. After a few more trips, I found another jet pack in my machine, as well as some of my machines having been moved to a previous state. This might be a Mekanism bug, or just 1.16.1 being weird, but I'm not quite sure.

Steps to reproduce:

1. Took something out of machine
2. went to nether and came back
3. object is returned to previous state and may still be in inventory

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

Forge: latest
Mekanism: 10.1
Other relevant version:

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

[gist / pastebin / etc link here. Please make sure that it isn't set to expire.]

I've had the same thing happen on my private server I was hosting yesterday. It seemed similar to the book dupe to me in functionality, although it seemed to be a 50/50 chance the duped items would stay in my inventory or disappear. The block removal seems to appear only if you leave a chunk very quickly after placement.

I am going to assume you mean you are on version 10.0.1 not 10.1 as we have not made a version 10.1 yet. Could you please provide your latest log as maybe it will provide some clues.

Something in the chunk (could be non Mekanism) is likely causing errors on saving, so the chunk isn't being saved.

We need the log to be able to offer clues

What log file should I look for to get you guys?

Latest.log is its name

Ok I shut down the server, this is what I've got:
latest.log

Slightly hard to say but I wonder if https://bugs.mojang.com/browse/MC-194811 has something to do with this.

I am going ahead and marking this fixed in dev as I have made a bunch of changes in this commit 4777216 that I believe might fix this issue as it fixes various issues pertaining to chunks not properly unloading.

Thanks chief, sorry for the late upload of the log file.

I believe 10.0.2 (which is now released) should fix this issue. If it does not, feel free to comment (and provide a new latest log) and I will re-open the issue.