[MCPE-15044] Redstone lamps do not turn off immediately when unpowered Created: 07/Jun/16  Updated: 02/Jan/25

Status: Reopened
Project: Minecraft (Bedrock codebase)
Component/s: None
Affects Version/s: 1.17.30.22 Beta, 1.17.11 Hotfix, 1.14.25.1 Beta, 1.14.1 Hotfix, 0.15.0 Beta build 1, 0.15.0, 0.15.4, 0.15.6, 0.15.90.7, 0.15.10, 0.15.90.8, 0.16.1, 0.17.0.1, 0.16.2, 1.0.0.0, 1.0.0.1, 1.0.2, 1.0.3, 1.0.4.0, 1.0.4.1, 1.0.4.11, 1.0.5.13, 1.0.6.0, 1.0.5.54, 1.1.0.0, 1.0.7.0, 1.1.0.9, 1.1.0.55, 1.1.1.0, 1.1.3.1, 1.1.3.52, 1.2.9.1, 1.2.10.1, 1.7.0.9 Beta, 1.9.0, 1.12.0, 1.16.101 Hotfix, 1.16.201 Hotfix, 1.16.210, 1.18.31, 1.19.0, 1.20.30, 1.21.51 Hotfix
Fix Version/s: None

Type: Bug
Reporter: [MCPE Helper] Dylan K. Taylor
Resolution: Unresolved Votes: 24
Labels: redstone, redstone_lamp

Attachments: File mobizen_20160607_121224.mp4    
Issue Links:
Duplicate
is duplicated by MCPE-20017 Strange (unexpected) behavior with re... Resolved
is duplicated by MCPE-21764 Redstone lamps has a delay when turni... Resolved
is duplicated by MCPE-108607 Observer Tick speed wrong? Resolved
Relates
relates to MCPE-37479 Command blocks fail to recognize thei... Open
relates to MCPE-15607 Pistons take 3 redstone ticks to exte... Resolved
Confirmation Status: Confirmed
Platform: Multiple
CHK:
ADO: 51530

 Description   

When turning off power to a redstone lamp, there is a delay of a fraction of a second before the lamp actually goes dark.

This is most noticeable in clock circuits involving redstone lamps, which no longer work correctly.

The attached video demonstrates the issue. The piston in the video demonstrates that the clock circuit is indeed working correctly, however the redstone lamp does not turn off quickly enough to produce the expected flashing effect.

I'm also experiencing frequent crashes when I open a world and look at a clock circuit containing a redstone lamp like the one in the video.

Edit by SuperGeniusZeb: By using observers, you can clearly see that this behavior is in fact a functional delay, and not just a visual one. Hook up an observer to a redstone wire, and have that wire hooked up to a redstone lamp. Make another observer observe that lamp, and power the wire. Both observers will output a signal simultaneously. Now unpower the wire. Notice how the observer that is observing the redstone wire activates before the observer observing the lamp does.

Also, I can't repro the crash mentioned in the original description, so I assume that was a separate bug that has long since been fixed.



 Comments   
Comment by [Mod] tryashtar [ 18/May/22 ]

Here's a comparison with java edition: https://streamable.com/qnjavb
Java takes 0 ticks to power, 4 to depower
Bedrock takes 2 or 3 ticks to power, 6 to depower

Comment by [Mod] tryashtar [ 21/Aug/21 ]

Still an issue

Comment by [Mojang] Mega_Spud (Jay Wells) [ 20/Aug/21 ]

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response

Is this still an issue in the latest version? If so, please add a comment or update the affected version field.

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Comment by Douglas F Correa [ 17/Mar/21 ]

Affects 1.16.210. Just checked on Java & although it exhibits similar behavior, it is still possible to flicker it with a 2 redstone tick clock. On Bedrock, the fastest clock that flickers the redstone lantern is a 3-RT clock.Β 

Comment by Douglas F Correa [ 01/Dec/20 ]

Same thing with JE. Related toΒ MC-172213?

Comment by MaladjustedPlatypus [ 01/Nov/17 ]

Affects 1.2.5.15 (1.2.5 Beta Build 3).

Comment by Zeb [ 25/Feb/17 ]

By using observers, you can clearly see that this behavior is in fact a functional delay, and not just a visual one. Hook up an observer to a redstone wire, and have that wire hooked up to a redstone lamp. Make another observer observe that lamp, and power the wire. Both observers will output a signal simultaneously. Now unpower the wire. Notice how the observer that is observing the redstone wire activates before the observer observing the lamp does.

Comment by Zeb [ 10/Oct/16 ]

Affects 0.15.10 & 0.15.90.8 (0.16.0 beta build 5).

Comment by Zeb [ 16/Sep/16 ]

Affects 0.16.0 Beta Build 4 (AKA 0.15.90.7).

Comment by Zeb [ 27/Aug/16 ]

Confirmed for 0.15.6. (Tested on Windows 10.)

Comment by Zeb [ 08/Aug/16 ]

Confirmed for 0.15.4. (Tested on Windows 10.)

Comment by AMAN4700 [ 08/Aug/16 ]

Please respond and add the current version if you can reproduce this issue.

Comment by Zeb [ 25/Jun/16 ]

Confirmed for 0.15.0. (Tested in Windows 10.)

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