Observer block doesn't detect all block state changes
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
EDIT by Zeb: This bug is not with the observer, which is working fine. The bug is actually with all of the blocks/events listed below, because they actually don't cause block updates at all.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
- Snow Layer Created by Snow Golem
- Water/lava flowing (referring to the liquid that is already there not receiving a block update when it spreads)
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
Linked Issues
is duplicated by9
MCPE-15477Placing redstone dust doesn't cause a block updateDuplicateMCPE-15593BUD detector doesn't detect several stuffDuplicateMCPE-15649Observer doesn't consider BUD from button activated fenceDuplicateMCPE-15971Observer BlockDuplicateMCPE-16289Observer block doesn´t give of a puls when the state of Activator rail changesDuplicateMCPE-16640Observer wont detect certain thingsDuplicateMCPE-17499Observers do not detect updates of the piston body (bottom part of the piston)DuplicateMCPE-21762Observers do not detect torch burnoutDuplicateMCPE-22213Observer Doesn't Detect Placement Of Redstone DustDuplicate
![[Mojang] Mega_Spud (Jay Wells)](../../../data/avatars/users/92696.png){kind=small}
- Fixed
Victor Camarillo- 23
- 15
- Confirmed
- 31509
- Phone - Android - Samsung Other (Specify in description)
- Android 4.4
- block-update observer redstone
0.15.0 Beta build 1 - 1.1.3.52
0.15.0 Beta build 1 0.15.0 0.15.1 Beta 1 0.15.1 0.15.2 0.15.3 0.15.6 0.15.7 0.15.90.7 0.15.10 0.15.90.8 0.16.0 0.16.1 0.17.0.1 0.16.2 1.0.0.0 1.0.0.1 1.0.0 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 1.1.0.1 1.0.6.52 1.1.0.4 1.0.7.0 1.1.0.9 1.1.0.55 1.1.1.0 1.1.3.1 1.1.3.52- 1.2.0.2
Created Issue:
Observer block doesn't read all block updates
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
is duplicated by
is duplicated by
relates to
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Activating Weighted Pressure Plates
- Top half of door
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
Fence Gates activated by redstone.Change the daylight sensor.Redstone torches changing state- Red
ucing snowlayers' height when shot with arrows.- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Activating Weighted Pressure Plates
- Top half of door
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Activating Weighted Pressure Plates
- Top half of door
is duplicated by
is duplicated by
relates to
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Activating Weighted Pressure Plates
- Top half of door
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Activating Weighted Pressure Plates
- Top half of door
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Top half of door
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
is duplicated by
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
- Snow Layer Created by Snow Golem
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
Observer block doesn't read all blockupdatesObserver block doesn't read all block state changes
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
EDIT by Zeb: This bug is not with the observer, which is working fine. The bug is actually with all of the blocks/events listed below, because they actually don't cause block updates at all.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
- Snow Layer Created by Snow Golem
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
is duplicated by
relates to
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
EDIT by Zeb: This bug is not with the observer, which is working fine. The bug is actually with all of the blocks/events listed below, because they actually don't cause block updates at all.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Reducing snowlayers' height when shot with arrows.
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
- Snow Layer Created by Snow Golem
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
Observer block doesn'treadall block state changesObserver block doesn't detect all block state changes
We all know that when redstone ore is being mine, step on or just being touch it start glowing which is a block update but the observer block doesn't read this block update which means that the observer doesn't give off a redstone signal and yes i do know how the observer block work. But it does work with other block update but not when the redstone ore block is being updated so it can glow. My phone is a samsung galaxy s4.
EDIT by Zeb: This bug is not with the observer, which is working fine. The bug is actually with all of the blocks/events listed below, because they actually don't cause block updates at all.
List of things not detected by Observer (Keep updated):
- Redstone ore glowing
- Fence Gates activated by redstone.
- Change the daylight sensor.
- Redstone torches changing state
- Growing Cocoa Pods
- Lighting Nether Portal
- Powering Activator Rails
- Placing Redstone Dust
- Piston activating (the body, not the head)
- Snow Layer Created by Snow Golem
- Water/lava flowing (referring to the liquid that is already there not receiving a block update when it spreads)
Update by [Mojang] Adrian Östergård
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicated comments. Post only NEW information regarding this bug.
is duplicated by
is duplicated by
![[MCPE Mod] Celesian](../../../data/avatars/users/81635.png){kind=small}
![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
relates to
Just a theory: Perhaps the same reason it doesn't play a sound is the same reason opening fence gates with redstone circuits will not trigger an Observer? (See discussion on MCPE-14710) It could be that the fence gates don't trigger a block update when powered by redstone, though I'm not sure if its sounds are tied to that or not.
Possibly "Duplicate" of MCPE-14710
MCPE-14710 seems to be about the observer not detecting changes in block data. Here the whole block changes. I think the part of the code to change for these two bugs isn't the same.
"Duplicate" of MCPE-14710
"Duplicate" of MCPE-14710
Thanks for your report! This is however a Duplicate of MCPE-14710 – If you have not, please use the search function in the future, to see if your bug has already been submitted, as currently over 47% of tickets are being closed as duplicate.
Thanks for your report! This is however a Duplicate of MCPE-14710 – If you have not, please use the search function in the future, to see if your bug has already been submitted, as currently over 47% of tickets are being closed as duplicate.
Thank you for your report. This issue was, however, submitted earlier as MCPE-14710. Please perform a search next time to make sure your bug hasn't already been reported. The parent issue can easily be found by searching for "mcpe unresolved observer".
I've marked this as duplicate and added this to the list in MCPE-14710.
Duplicate of MCPE-14710 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-14710.
It has been linked to this report. If you have additional information, please add it to that report.
If you have not, please search before reporting, as it's likely that one exists already.
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Part of this bug was seemingly fixed in MCPE-14710, but in 1.12 (again, maybe?) observers don't detect redstone ore lighting up.
The bug
Observers do not activate when the following changes happen:
- A campfire becomes a signal fire (hay block placed below)
- Adding an eye of ender to a portal frame
- Powering a door/trapdoor that's already open
- Fire catching on another face of a block
- Vines spreading to another face of a block
- Fences/panes/walls/iron bars changing connections
- Stairs changing shape
- Grass becoming snowy
- Adding/removing a music disc from a jukebox
- Adding/removing a book from a lectern
- Leaves distance changing (log placed nearby)
- Locking a repeater
- Note block changing instrument (block below changed)
- Note block getting powered
- Tripwire changing shape/connections
- Snow layers generating from snowfall
Related issues
- Hoppers getting powered:
MCPE-40843 - Pumpkin/melon stems moving:
MCPE-36783 - Nether wart growing: MCPE-41074
- Note blocks changing note: MCPE-53919
- Entering a bed: MCPE-46345
- Rail changing direction: MCPE-30544
- Respawn anchor charged: MCPE-75742
- Target block getting hit: MCPE-84391
- Kelp age changing: MCPE-179683
- Various fixed issues:
MCPE-14710
Affected:
Placing painting.Edit: Thanks Charlotte Buff, I thought the painting was different from PC. (Like Item Frames)
Place mob eggs inside mob spawner.Paintings and mob spawners are most likely intended to not work since paintings aren't blocks and applying eggs to spawners only changes the block entity and doesn't update the actual block.
Confirmed for Samsung Galaxy Tab 4. 0.15.0 build 1
Confirmed for 0.15.0 official release on Windows 10 Edition.
Also, some additional notes:
1. Redstone torches changing state don't affect the Observer at all. It's not just burned-out torches, it's any redstone torch changing state. Could it be possible that redstone torches do not use blockstates like the Java edition, and instead only use block entities? It may be works-as-intended for redstone torches. It could also be that redstone torches don't cause block updates at all when changing states, which could be the cause of several other redstone-related bugs as well...
2. Fence gates do not make any sound when powered by redstone... possibly related to the problem?
And also affected the activator rails when activated by redstone, lightening nether portal, and growing cocoa pods.
Confirmed for 0.15.1 alpha build 1.
Edit: I found a list in Minecraft Wiki, maybe some of them need to receive a block update.
Also placing redstone next to an observer does not activate it but changes in the redstone's state and breaking the redstone does activate it. Not sure if this is WAI. Seems to me like like placing redstone should count as a block update if breaking it does
Yeah, I think placing redstone dust should be detected. It do wonder, though, if most of these problems are with the observer, or i they're actually caused by the other blocks. Maybe redstone dust doesn't cause a block update when its placed, and perhaps the same thing for redstone ore glowing, cocoa beans growing, and other things like that. This could be technically a bug with lots of blocks, but not actually the observer itself... if anyone has the ability to read the MCPE code, it would be interesting to know how the observer block detects updates and how block updates are caused. That could help in diagnosing the cause of this bug.
Taken from
MCPE-15593:@Mega_Spud: As stated in earlier comments, I don't think changing the type of mob spawner should work with observers because it is an NBT change which doesn't cause a block update.
To remind you: My issue has images attached that explain HOW to reproduce them. Makes me upset if useful stuff is not attached
.Fixed for weighted pressure plates and doors in 0.15.90.2. (Tested on Pocket Edition.) I think the remaining cases may all be due to the blocks themselves not causing updates, and if so (if there isn't already), there should be a bug report for all the instances of blocks not causing block updates when they should. Except for placing a spawn egg in a spawner, because that only changes NBT data and doesn't cause an update on the Java edition either.
I will try and check using the melting-ice-into-floating-water trick to check if the remaining cases even cause block updates at all.
I can confirm that fence gates activated by redstone, switching the orientation of rails, and inverting redstone torches all do NOT cause block updates. Therefore, this bug is incorrect as it is a bug with the blocks themselves, NOT the Observer.
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Affects 0.16.0 Beta Build 4 (AKA 0.15.90.7).
Could a moderator please update the description to reflect the fact that this bug is now fixed for doors and weighted pressure plates, and also the fact that placing spawn eggs in a monster spawner should NOT cause a block update and therefore the bug doesn't apply to that block? EDIT: Thanks, but you forgot to remove the top halves of doors from the list.
Fixed (err the description, not the whole bug!), as per [~zebulanstanphill@gmail.com].
Affects 0.15.10. (Tested on Windows 10.)
What about making them act like in PC? (except for the diagonal quasiconnectivity)
inxomnyaa: The observer can be made to output strong power and be coded just like the Java edition observer, but it is important to note that they will still act differently, since block/redstone updates happen differently in the 2 editions. For example, in the Java edition, if you point a repeater into a block and power the repeater, the repeater will update the block, and an observer can detect the block being updated. Actually, the repeater will update the spot in front of it regardless of whether or not there is even a block. And in fact, it actually causes updates on the blocks adjacent to the block in front of it. So the repeater causes at least 6 block updates, not counting itself updating.
In MCPE, repeaters cause no updates (except on themselves) unless there is a redstone component in front of them. If you point a repeater into a block and put redstone dust on the other end, the repeater will cause the redstone dust to turn on, causing a block update, but the block in-between will not be updated, as the repeater causes the redstone dust to update directly, and the redstone dust, in turn, doesn't update anything except itself, as there are no other components near it that it can power.
So because of this, observers in the Java edition will respond to a lot more things than MCPE observers, because the Java edition redstone components cause more redstone updates (most of which are unnecessary and cause lag) than the MCPE redstone components, which remember the location of nearby components and update them directly, rather than flooding the adjacent blocks with unneeded updates.
So even if observers were changed to output strong power like in the Java edition, you wouldn't be able to chain them with air blocks in between each observer, because the air blocks would never get updated by the observers output. I'm also not sure if MCPE observers themselves get updated when they're activated. If they do, then you could chain them by placing them in front of each other, but if they don't, then that would still not work.
It is also currently undetermined as to how many of the Java edition observer behaviors are intended, so its a bit too early to say what would need to be changed on which edition.
But all of that is somewhat unrelated to this bug, which is really misnamed. The observer block IS reading all block updates.
The real issue is that the things listed in this bug report don't cause block updates, even though they should. So this is not an observer bug... this is a bug with multiple blocks not causing block updates when they should.
rplatham Could you please change the name of this bug to something like "Some blocks don't cause block updates when they should" or something like that? I've tested these instances with the floating-water-block-update-trick/test and I can confirm that the observer is working fine... it is the other blocks that aren't causing any updates.
You might want to add Minecraft Java version as an affected Minecraft edition because of the addition of observer blocks in 16w39a. A very similar glitch occurs there. When opening and closing a door or fence gate, the observer does not detect this block update. I'm sure there are other block updates not detected, but that is just one.
ClassyElm Java edition bugs should be reported on the Java edition bugtracker. The MCPE bugtracker only tracks MCPE bugs.
https://bugs.mojang.com/browse/MC
Added snow layer created by snow golem to the list in the description.
(Snow layers placed by a player are detected)
Revised title to be more accurate. (The observer DOES detect all block updates... some blocks simply aren't causing block updates when they should.)
The lava/water source flowing can't be detected either.
I was trying to build this: https://www.youtube.com/watch?v=myDz5EwyWHw
(Yes, it also uses quasi-connectivity, but that can be easily changed).
Observers still not detecting Redstone Ore activation on 1.2.5. Why no fix yet? this was reported a year ago!