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Bug
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Resolution: Unresolved
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None
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1.21.40.20 Preview, 1.18.10.21 Beta, 1.18.0.24 Beta, 1.17.11 Hotfix, 1.17.0.50 Beta, 1.16.220, 1.16.100.58 Beta, 1.16.100.55 Beta, 1.16.100.53 Beta, 1.16.20.54 Beta, 1.16.20.53 Beta, 1.16.0.67 Beta, 1.16.0.63 Beta, 1.16.0.61 Beta, 1.16.0.57 Beta, 1.16.0.55 Beta, 1.16.0.53 Beta, 1.15.0.55 Beta, 1.15.0.54 Beta, 1.15.0.53 Beta, 1.15.0.51 Beta, 1.14.30.51 Beta, 1.14.2.51 Beta, 1.14.2.50 Beta, 1.14.0.51 Beta, 1.13.3, 1.13.1, 1.14.1 Hotfix, 1.14.0.3 Beta, 1.2.6.55, 1.2.6.60, 1.6.0.8 Beta, 1.8.0.11 Beta, 1.7.0, 1.9.0.3 Beta, 1.9.0, 1.11.0.5 Beta, 1.12.1, 1.13.0, 1.14.1.2 Beta, 1.14.0, 1.14.30 Hotfix, 1.14.60 Hotfix, 1.16.40 Hotfix, 1.16.201 Hotfix, 1.17.41 Hotfix, 1.18.0, 1.18.2 Hotfix, 1.18.10, 1.18.12 Hotfix, 1.18.30, 1.18.31, 1.19.0, 1.19.2 Hotfix, 1.19.30, 1.19.51, 1.19.63, 1.19.83 Hotfix, 1.20.51 Hotfix, 1.21.2 Hotfix, 1.21.22 Hotfix, 1.21.23 Hotfix
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None
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Confirmed
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Windows
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94243 / 95333
Edit by depressed-pho, updated by GoldenHelmet:
Original test world was unreliable because it had the observer looking at lit redstone dust across a chunk border. Test world and description updated to include other blocks on Novermber 2, 2021.
Observers looking at several kinds of blocks emit a pulse on world reloading. The attached test world demonstrates the bug. The following blocks were tested in 1.17.41 Hotfix:
Block | Triggers observer pulse on relog |
---|---|
Lit redstone dust | ![]() |
unlit redstone dust | ![]() |
Redstone torch (lit or unlit) | ![]() |
Repeater (powered or unpowered) | ![]() |
Comparator (powered or unpowered) | ![]() |
Empty single chest | ![]() |
Empty double chest | ![]() |
Chest with item in it | ![]() |
Dropper (empty or with item) | ![]() |
Item frame | ![]() |
Glow item frame | ![]() |
Tripwire with mob on it | ![]() |
Pressure plate with mob on it | inconsistent |
Mob head | ![]() |
Campfire | ![]() |
Cauldron | ![]() |
Steps to reproduce:
- Open the attached world.
- Close and open it again.
- See what the dispenser does.
Strangely, the pulse is too short (0 ticks maybe?) for dispensers to trigger so you need a repeater to make the pulse a bit longer.
I have created a contraption that, when not in use, constantly powers a series of dispensors. However, relogging with this contraption nearby unpowers and repowers the redstone, causing the dispensors to dispense their items without player interaction.
Video shows the bug, and also the Minecraft version being run
- is duplicated by
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BDS-16869 Observer moves on its own, when I log in to world.
- Resolved
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BDS-19542 observers output a signal when detecting powered redstone dust upon loading a world
- Resolved
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MCPE-23467 Observer activates when opening world.
- Resolved
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MCPE-32016 Powered (unchanging) Redstone dust causes an observer to update when reloading a world
- Resolved
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MCPE-36209 Observers activate when chunks are reloaded.
- Resolved
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MCPE-37788 Observer activates when detects powered redstone dust after loading the world again
- Resolved
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MCPE-46656 Observers with item frames placed on the front will activate upon loading of world
- Resolved
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MCPE-51725 Powered observers send out pulse upon relogging
- Resolved
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MCPE-53354 unexpected update of observer
- Resolved
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MCPE-54912 Observer behaivior
- Resolved
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MCPE-57607 Observers randomly trigger when facing a box with all slots filled
- Resolved
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MCPE-80648 Double chests and observers
- Resolved
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MCPE-83086 observer
- Resolved
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MCPE-112893 Observer block looking at chest pulses on relog if chest is not empty
- Resolved
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MCPE-112898 Campfire Causing Block Update on Loading World
- Resolved
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MCPE-154815 Observers exposed to powered redstone send out a signal while the world is loading.
- Resolved
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MCPE-158580 Containers with items will trigger observers when a world is loaded.
- Resolved
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MCPE-167881 Observer triggers on login
- Resolved
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MCPE-170797 Random trigger of observer block
- Resolved
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MCPE-184504 Redstone signal bug when starting a world
- Resolved
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MCPE-186395 Observers emit impulses when reloading the world
- Resolved
- relates to
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MCPE-58151 Repeaters Don't Save Pending Tick Information
- Reopened
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MCPE-165337 Observers fire when placed by Structure Block
- Open
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MCPE-179412 Dispenser with bucket may fail to pick up water or lava if activated immediately before/after relog
- Open
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MCPE-179848 Simple automatic crafters can break when you reload the world
- Open
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MCPE-13608 Redstone components update when world is reloaded
- Resolved
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MCPE-31389 Beds that span a chunk border can partially break or become invisible during chunk loading
- Resolved
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MCPE-178489 Unloading and reloading chunks results in an initial on-state for sculk sensors
- Resolved