[MC-8457] Chest sometimes doesn't activate Redstone Comparator when Hopper is below it Created: 26/Jan/13 Updated: 22/Aug/23 |
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| Status: | Reopened |
| Project: | Minecraft: Java Edition |
| Component/s: | None |
| Affects Version/s: | Snapshot 13w04a, Snapshot 13w05a, Snapshot 13w06a, Minecraft 1.5, Minecraft 1.5.1, Minecraft 14w20b, Minecraft 1.8, Minecraft 1.8.1-pre4, Minecraft 1.8.1, Minecraft 1.8.2-pre1, Minecraft 1.12, Minecraft 1.13.1, Minecraft 1.13.2-pre1, Minecraft 1.13.2-pre2, Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 4, 1.14.4, 1.16.1, 1.16.2 Pre-release 1, 1.16.2 Release Candidate 1, 1.16.3 Release Candidate 1, 1.16.3, 1.16.4 Pre-release 2, 1.16.4, 20w49a, 20w51a, 1.19.2 |
| Fix Version/s: | None |
| Type: | Bug | ||
| Reporter: | Jay Eff | Assignee: | Unassigned |
| Resolution: | Unresolved | Votes: | 30 |
| Labels: | redstone | ||
| Attachments: |
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| Issue Links: |
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| Confirmation Status: | Confirmed | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Category: |
Redstone
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| Mojang Priority: | Normal | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Area: | Platform | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Description |
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If a Hopper pipe is routed over a Chest where items drop into it, and a Hopper pipe is routed under the Chest to catch the items passing through the Chest, sometimes the items pass through the chest without triggering a Redstone Comparator that is attached to the Chest. How to reproduce (see screenshot for clarification): Place a Chest and put a Hopper over it. Put a Redstone Comparator against the Chest so it turns ON when an item is placed in the Chest. Put a Hopper under the Chest, and the item will drop into it and turn OFF the Redstone Comparator. Add several Hoppers against the bottom Hopper to create a pipe so the item ends up in the last Hopper. If you place an item in the upper Hopper, sometimes the Redstone Comparator will flash indicating something passed through the Chest before the item drops into the Hopper below it, and sometimes it won't. The item will always pass through to the last Hopper. If the Redstone Comparator does NOT flash when an item is placed in the upper Hopper, try putting an item directly into the Chest and the Redstone Comparator will most likely flash. After that, the Redstone Comparator will most likely flash when an item is put into the upper Hopper. But if you despawn the chunk where this structure is located (go far away and come back), the Redstone Comparator will not flash until the Chest is accessed directly again. Gotchas:
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| Comments |
| Comment by Ryan Shaw [ 29/Sep/19 ] |
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This bug still exists in 1.14.4 (vanilla) I have reproduction in my minecraft server. With a chest minecart unloading into a vertical line of hoppers, an item passes through the hopper connected to a comparitor for what seems like 0-1 ticks - it barely even flashes in the inventory when viewing the hopper's contents. The comparitor does NOT light up unless the item is in the hopper for a longer time (e.g. pausing/locking the hopper) Tldr the comparitor doesn't output signal when an item is in hopper for very small amount of time. The weird thing is, when this was built it worked fine. I assume at some point the chunk was unloaded and when reloaded it was broken. Destroying the comparitor and replacing it does fix the issue. The root cause may be the item being in hopper for too short duration, it seems far too short for normal hopper behavior. |
| Comment by Kraif [ 19/Oct/18 ] |
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Confirmed for 1.13.2-pre2. |
| Comment by Kraif [ 16/Oct/18 ] |
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Confirmed for 1.13.2-pre1. Please, if you don't mind, I'd like to be the reporter of this ticket. I'll update it accordingly. |
| Comment by Kraif [ 05/Sep/18 ] |
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Confirmed for 1.13.1. |
| Comment by [Mod] NeunEinser [ 23/Jul/17 ] |
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Can confirm for 1.12 |
| Comment by Galaxy_2Alex [ 26/Sep/16 ] |
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue. Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. It will be reopened as soon as the requested information has been delivered. |
| Comment by Marcono1234 [ 23/Jun/16 ] |
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Relates to |
| Comment by Hartspoon [ 02/Mar/14 ] |
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Still a concern in 14w08a. Probably relates to MC-11193. |
| Comment by qmagnet [ 15/Jan/14 ] |
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Could you update the current version to 14w02c? My specific issue posted on |
| Comment by qmagnet [ 21/Jul/13 ] |
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My bug got posted as a duplicate of this one. I'm not sure if it's the same problem. But posted a picture to explain. Comparator does not output a signal from the stacked hopper while items are travelling through unless a redstone signal is active near it but not powering the hopper. The left side has no output from the comparator while the items are moving. The right side does receive output because of an indirect redstone signal. This make no sense - almost as if the redstone is slowing the item down enough for the comparator to make a signal. Note that the redstone signal does not close the hopper. Further testing shows you also need to more than 1 hopper below the powered block for the item to pass. |
| Comment by Michael Turner [ 23/Mar/13 ] |
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Confirmed in 1.5.1. |
| Comment by Michael Turner [ 19/Mar/13 ] |
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Still exists in 1.5. A horizontal row of hoppers with a comparator attached to each one blinks each comparator as expected, but a vertical row of containers (not limited to hoppers) does not. This implies that the delay that occurs when a hopper is putting something into a container is long enough to set off the comparator but if another hopper is also pulling from that container then the delay is too short. |
| Comment by remy waalen [ 08/Mar/13 ] |
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I got the same thing in the pre-release with a vertical hopper setup. |
| Comment by Michael Turner [ 04/Mar/13 ] |
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Confirmed. Tested with chests, hoppers, and dispensers. The items don't seem to stay in the container long enough for the attached comparator to register it's presence. |
| Comment by Jay Eff [ 04/Mar/13 ] |
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I tested this with 13w09c, and now a comparator connected to a chest does not work at all, no matter what the configuration or orientation of the comparator... Looks like there's more bug-stomping to do. |
| Comment by Michael Turner [ 27/Feb/13 ] |
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This may have been fixed along with |
| Comment by Anon Ymus [ 10/Feb/13 ] |
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Confirmed. |
| Comment by Monch [ 04/Feb/13 ] |
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I get this too - I set up a group of furnaces that are logs via a hopper loop, and one of the furnaces is always skipped entirely. I attached two screenshots of a simple system to replicate the bug: |
| Comment by Michael Turner [ 27/Jan/13 ] |
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I found this issue with a horizontal line of hoppers. I placed a comparator against one and the system would output a short redstone signal when an item passed through the hopper. This worked as expected until I relogged from the server, after which the comparator never sent out a redstone signal until I destroyed the hopper it was attached to and replaced it. Again it worked until the chunk was unloaded. |