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Comparators not updating when items are pulled from doublechests


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This is a problem that happened before, but according to github it was fixed in 2017. Well, it was not. Depending on the side of the chest the removed item is, comparator will update or won't. It will happen only if removed by a hopper or minecart with hopper. If you remove items manually it works good.

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Can you specify a Minecraft version and a Forge version? (Please don't use words like "latest")

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.


As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.


For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.


Logs (Most issues require logs to diagnose):


Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.


What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...


...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension


Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.


Curse/Overwolf: If you are using the Curse Launcher, their configurations break Forge's log settings, fortunately there is an easier workaround than I originally thought, this works even with Curse's installation of the Minecraft launcher as long as it is not launched THROUGH Twitch:

  1. Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
  2. Make a launcher profile targeting this version of Forge.
  3. Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
  4. Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.






or alternately, 


Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft


Server Not Starting:


If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.


Reporting Illegal/Inappropriate Adfocus Ads:


Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.


Posting your mod as a GitHub Repo:


When you have an issue with your mod the most helpful thing you can do when asking for help is to provide your code to those helping you. The most convenient way to do this is via GitHub or another source control hub.

When setting up a GitHub Repo it might seem easy to just upload everything, however this method has the potential for mistakes that could lead to trouble later on, it is recommended to use a Git client or to get comfortable with the Git command line. The following instructions will use the Git Command Line and as such they assume you already have it installed and that you have created a repository.


  1. Open a command prompt (CMD, Powershell, Terminal, etc).
  2. Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
  3. Run the following commands:
    1. git init
    2. git remote add origin [Your Repository's URL]
      • In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
    3. git fetch
    4. git checkout --track origin/master
    5. git stage *
    6. git commit -m "[Your commit message]"
    7. git push
  4. Navigate to GitHub and you should now see most of the files.
    • note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
  5. Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]


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i can confirm this bug,

replicated in: forge-1.15.2-31.1.0 (recommended) and forge-1.15.2-31.1.47 (latest as of today) [no other mods installed]


this bug does NOT occur in vanilla minecraft 1.15.2


bug description:

when items are pulled from doublechests with a hopper/hopperminecart, comparators going 'out' of this double chest do not update properly, until the doublechest is opened (and thus itself block-updated) by the player manually.

i noticed that basically only the 3 comparators going out of the corresponding half (*) of the doublechest from which the last item was pulled update correctly and the 3 comparators on the other side no not update. it does not matter from which side of the doublechest the items got pulled by a hopper, only in which half the last item was located inside the chest.

(* standing in front of a doublechest, the 'left halft'/'left block' of the inventory corresponts to the top 3 inventory rows of this chest, and the 'right half' of the chest to the bottom 3 inventory rows)

Edited by RescueGum
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  • 4 weeks later...

I have come across this bug and therefore it makes building certain redstone structures pretty hard.


I tested this in Minecraft 1.15.2  Forge version 31.2.0  no other mods installed just forge.


This does not happen in a vanilla game


any chance of a fix? I like to run forge so i can run map mods on a vanilla game basically but cant as this breaks some of my redstone contraptions 


Edited by iamtheomen
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  • 1 month later...

Is there any chance this bug will be addressed and corrected in the next stable 1.16 forge version? I've just finished a huge silos system in a server with my buddies and it ain't work... because of this bug, it's so frustrating. It would also break other automated systems I'd like to build and the workarounds are sometimes doable but really annoying to perform, forcing me to reproject often the whole thing. We play with almost no mods so if this problem won't be fixed I'd rather play pure vanilla, but it would be quite sad because of a couple of mods we love playing with (Better Crafting Table is my favourite).


I've tried the latest version with no mods in a new 1.16 world (forge-1.16.1-32.0.24) and the bug is still there.

Edit: I created a new thread, since this bug affects the latest forge version:


Edited by YellowInTheRealm
Bug found in the latest version, added a link to a new thread.
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