Portals crossing chunk border only partially lit
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal.
- Make sure that at least the south or east half of the portal in the nether corresponds to overworld coordinates that are south or east of the portal in the overworld.
- Go back through the southern or eastern half of the portal in the nether.
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Linked Issues
is duplicated by12
MCPE-76427If a 3 block with nether portal crosses a chunk line it can glitch out and show only one part of the portalDuplicateMCPE-80368The Nether Portal's purple stuff doesn't cover the entire obsidian frame on large Nether PortalsDuplicateMCPE-83782Portal Bug!!Check out the file belowDuplicateMCPE-85761Nether portal will randomly be unlit. This cause portals to teleport you to the wrong portal. When entering the nether portals with randomly become unlit.DuplicateMCPE-90636I have no idea why this happens to my portalDuplicateMCPE-95549nether portal not generating correctly when opening worldDuplicateMCPE-96019half lit nether portalDuplicateMCPE-97973Large nether portals are sometimes half-lit upon reloading a worldDuplicateMCPE-103630Portal doesn't work if not in one chunkDuplicateMCPE-118794Nether portals created/lit on chunk borders disappear/unlit after relogging.DuplicateMCPE-121816Nether potral disappearing (or incomplete)DuplicateMCPE-136914Nether portal being unlit Duplicaterelates to5
MCPE-97950End gateway sometimes generates incompletely at chunk bordersConfirmedMCPE-31389Beds that span a chunk border can partially break or become invisible during chunk loadingFixedMCPE-67479Cocoa pods on chunk borders can break when loadingFixedMCPE-86396GrindStones attached to a block on chunk borders break when reloadingIncompleteMCPE-106030Double chest shows half invisible and may crash when opened or brokenFixedAttachments9
![[Mod] GoldenHelmet](../../../data/avatars/users/18951.svg){kind=small}
Created Issue:
Broken, half-lit Nether portal
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Environment
Bedrock on a Realms server
Attachments2
![[Mod] OcelotOnesie](../../../data/avatars/users/43220.png){kind=small}
REALMS-3543 → MCPE-74333Bedrock on a Realms server
is duplicated by
relates to
is duplicated by
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal (OR save & quit in the chunk with the south or east end of the portal).
- Go back through the portal in the nether (OR reload the world).
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can probably increase the chance of this happening by increasing the loading burden, for example by increasing the number of updating mobs and updating blocks in the area around the portal, increasing the number players connected to the world, or increasing render distance and simulation distance.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
relates to
is duplicated by
![[MCQA] Kinga Izdebska](../../../data/avatars/users/18949.svg){kind=small}
Portals test & Despawn-1.mcworld
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal (OR save & quit in the chunk with the south or east end of the portal).
- Go back through the portal in the nether (OR reload the world).
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can
probablyincrease the chance of this happening by increasing the loading burden, for example by increasing the number of updating mobs and updating blocks in the area around the portal, increasing the number players connected to the world, or increasing render distance and simulation distance.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal (OR save & quit in the chunk with the south or east end of the portal).
- Go back through the portal in the nether (OR reload the world).
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
Go through the nether portal (OR save & quit in the chunk with the south or eastendof the portal).- Go back through the
portal in the nether (OR reload the world).Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal.
- Make sure that at least the south or east half of the portal in the nether corresponds to overworld coordinates that are south or east of the portal in the overworld.
- Go back through the southern or eastern half of the portal in the nether.
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal.
- Make sure that at least the south or east half of the portal in the nether corresponds to overworld coordinates that are south or east of the portal in the overworld.
- Go back through the southern or eastern half of the portal in the nether.
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
Updated description by [Mod] GoldenHelmet
Steps to reproduce
- Build a nether portal in the overworld that crosses a chunk border.
- Go through the nether portal.
- Make sure that at least the south or east half of the portal in the nether corresponds to overworld coordinates that are south or east of the portal in the overworld.
- Go back through the southern or eastern half of the portal in the nether.
Expected result
The nether portal in the overworld stays intact.
Actual result
The nether portal in the overworld partially breaks.
Note: as this is due to loading lag, you can increase the chance of this happening by increasing the loading burden. What triggered it for me was:
- Run Minecraft in full-screen mode.
- Set render distance to max.
- Drop lots of items in the chunk with the south or east portion of the portal.
Increasing simulation distance and random tick speed, and using the portal with a 2nd LAN player, did not trigger a portal break.
Original description
So, in my Realms world, I spent a decent amount of time putting together a nice little cave-looking entrance to my 11x8 nether portal with a diorama behind it (blocked by glass blocks) so it looks like you're looking into the nether as you're entering the portal... It looked exactly how I wanted it to, and worked as expected for a day or so.
Yesterday, (~18 hours after using it successfully several times) I entered the nether, and, upon coming back to the overworld, my portal was...wonky. Take a look at the images... As you can see, it's no longer filling the entire frame. I've broken and re-lit it several times over the course of the past 24 hours. Each time I relight it, it's full-sized, but every time I use it to go into the nether and then back into the overworld, it looks like this...
The only added detail I have, relates to when/how it happened... I entered the nether and there were two zombie pigman standing on the portal blocks there. I immediately went back into the overworld to see if I could find them there, and I found that I was holding one of their swords and my portal was broken as shown in the link... It's like my portal somehow glitched, killed the pigman, and the sword dropped into my hand...? No idea. Could it be an chunk-border issue?
is duplicated by
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
is duplicated by
is duplicated by
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relates to
relates to
is duplicated by
Broken, half-lit Nether portalPortals crossing chunk border only partially lit.
relates to
![[Helper] lillybeacon](../../../data/avatars/users/93893.png){kind=small}
is duplicated by
is duplicated by
Portals crossing chunk border only partially lit.
is duplicated by
We're tracking this issue as MCPE-74333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you aren't already, please don't forget to use the search feature, the less time volunteers spend linking duplicates the more time we have to update new reports.
Voting on an existing report has a greater impact on getting the bugs most important to you fixed!
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We're tracking this issue as MCPE-74333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you aren't already, please don't forget to use the search feature, the less time volunteers spend linking duplicates the more time we have to update new reports.
Voting on an existing report has a greater impact on getting the bugs most important to you fixed!
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
TNC Cuban I appreciate your interest in the despawning issue, so hear me out. I can assure you that I've read all of the comments on MCPE-21416 multiple times, and chunk borders can't be the only factor. There are both strong arguments against it (such as this comment), and there is evidence against it (such as this comment and mine describing tests). Does that mean MCPE-21416 covers two different issues? Maybe, but unfortunately, since no one can give reliable steps to reproduce or a world save that reliably reproduces, we just don't know. So, as it stands, all reports of random unexpected despawns get resolved as duplicates of MCPE-21416. The explanation you've suggested to be well-known
the game dosent know which chunk to save the information in and just deletes the mob, and the Dev's dont know of a way to fix it
is still just speculation at this point.
If you'd like an example of what would need to be done with the chunk border theory to separate it out from other random despawns, take a look at what I did with ridden entities in MCPE-51837. If a reproducible test like that could be made for chunk border despawning, then we could separate that as a specific issue. It can be said for sure that chunk borders are a factor in some other bugs, such as MCPE-31389, MCPE-47212, MCPE-48054, MCPE-67479, and MCPE-74333. But we haven't nailed it down for the random despawns yet.
I'd actually be interested to get the coordinates of the chunk where your villagers disappeared. My present hypothesis on random despawns is that it could have something to do with the actual coordinates or chunk that the entity is in. I recently determined that the "stuck at loading screen" issue (MCPE-44815) is triggered by specific coordinates regardless of what else is around the area. I'd like to explore if this could be the case for entities getting accidently deleted.
Thank you for your report!
We're actually already tracking this issue at MCPE-74333, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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Thank you for your report!
We're actually already tracking this issue at MCPE-74333, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're actually already tracking this issue at MCPE-74333, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're actually already tracking this issue at MCPE-74333, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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@Rogue Cheddar How did I calculate the numbers? Just by counting blocks from the torches on the wall. How did I put them in the picture? I opened the picture in MSPaint, cropped it, typed the numbers on it, and saved.
As far as your platform, I think the device would only make a difference insofar as different devices have different processing power and save/load times, and that could impact how reliable the saving and loading is. There are several bugs that depend on slow loading (MCPE-31389, MCPE-74333, etc.) that I can reproduce by bogging down my PC.
However, the fact that you had a lot of despawn problems on your realm and none while playing locally may point to another issue. A lot of the comments on this ticket relate to realms worlds. According to MCPE-92017, realms actually continue running while no one is logged in. It seems to me that could be a huge source of the random despawns. If the "save and quit" process does not work the same on realms as it does on local worlds, perhaps it is more like crashing?
Thank you for your report!
We're actually already tracking this issue at MCPE-74333, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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Thank you for your report!
We're tracking this issue in MCPE-74333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're tracking this issue in MCPE-74333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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Thank you for your report!
We're tracking this issue in MCPE-74333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Assuming the portal crosses a chunk border and only the obsidian frame blocks of one side are in a different chunk than the rest, this is the same issue as MCPE-74333.
Does MCPE-74333 describe your issue?
This portal runs along the Z-axis. -369 and -370 are both portal blocks, while >= -368 are simply obsidian. Using a chunk calculator, I see that this is clearly a chunk border. Is this expected behavior along a chunk border?
Does the same behavior occur on a downloaded copy of the world?
It does not. My server owner downloaded the realm locally, broke the portal, relit it, and upon coming back out of the nether, the portal was still intact.
EDIT: server owner has confirmed that the portal IS still breaking as detailed in my post in an offline world.
Thanks for answering the questions. If you try to use the portal on the side that is "broken" does it still work as a portal? As in, is the effect just visual? Does it matter which block you light the portal on?
Edit: I'm going to request to move this to the "MCPE" project since it is apparently not specific to REALMS, so thank you for that additional information.
Thanks for redirecting to the proper team.
To answer your question related to the portal: No, it does not. When the portal is "broken", I can stand on the unlit obsidian and it acts exactly as unlit obsidian; no particles, no teleporting to the nether. After breaking and re-lighting the portal, it does not matter which block is "lit", the result is the same–upon re-entering the overworld, the portal is in it's "broken" state where only the two blocks to the left are lit, and the others (in a separate chunk) are not.
Interestingly, I never return to the overworld standing on one of the actual portal blocks, but, rather, always on a normal obsidian block.
I'd like to add some additional commentary to this in the event that it's helpful... The overworld portal runs along the Z-axis, intersecting 2 chunks; the chunk border being directly between the lit and unlit obsidian blocks. In the nether, the portal runs along the X-axis not intersecting chunks in any way.
Hope that helps in some way.
It appears the same thing is happening here as can happen with beds that cross chunk borders. (
MCPE-31389) Where there is loading delay/lag, a chunk with half the portal loads first, does not detect portal tiles in the neighboring unloaded chunk, and then breaks. Just like with beds the bed head needs to be able to detect a bed foot or it will break, so with portals, portal tiles need to detect a connection to a portal tile at the saved location of the portal, which is its bottom north or west coordinate.@Wayne W could you provide the full coordinates of your bottom north portal block, and also the coordinate you spawn on when you go through and it breaks?
The northern most block on the bottom platform is located @ 950, 67, -370. After relighting, entering the nether, and reentering the overworld (thus breaking it again) I spawned on block 950, 67, -364.
I've reproduced the broken portal several times.
You can see in the above pic that I used Wayne's coordinates and copied the layer of blocks around it from his pictures. I rebuilt this in order to test whether the break could be triggered by the wall and fence blocks next to the portal blocks trying to connect to the portal blocks or updating their configuratoins as the chunk loads. However, that did not pan out. I was able to use the portal successfully many times.
What broke it was relogging with increased render distance and simulation distance. I tried relogging with increased random tick speed too, but that did not cause a break (just lots of zombie pigmen
)
EDIT: Re: The position where you spawn coming through the portal:
), if you enter the northern half of the portal in the nether you'll come out at 950, 67, -370, and if you enter the southern half you'll come out at -368 <= Z <= -364. It's when you come out in this area that the portal can break, because you are loading the southern part of the portal first and those portal tiles cannot detect portal tiles that connect to the saved portal location in the other chunk before it loads.
This doesn't seem to depend on breaking per se, but instead on where the portal in the other dimension is located relative to the portal you are coming out of. In the test world (Portals test & Despawn.mcworld
Is this just a visual issue, or does the portal break completely (meaning it can't be used)?
This issue affects the usage of the portal. Only the obsidian that appear as portal blocks can be utilized—the standard obsidian blocks do not act as portal blocks when attempting to enter the nether.
@[Mojang] Mega_Spud (Jay Wells) it's a complete break. This is the exact same chunk-border chunk-loading related breaking that occurs with invisible beds (
MCPE-31389) and cocoa pods (MCPE-67479). See my ealier comment above.You can get this to happen more reliably by having powered redstone dust next to a portal that crosses a chunk border. You then load it from the side the redstone dust is on. It gives a block update upon server restarts which updates the portal and breaks it, because the other half is unloaded.
Part of the issue is that portals can be updated from the side. If you stop this behaviour, this bug should stop happening.
Similar issues with redstone torches and signs were fixed in the exact same way. Those blocks only process block updates from certain directions. (sidenote: grindstones can be updated from all sides, maybe fix that too)
However, this is all part of a much bigger issue where instant updates can happen to blocks even if the survival of those blocks depends on things in unloaded chunks. Fixing that may be a good idea.
Also, this affects the 1.16 betas last time I checked.
If you have a copy of the world available, you might like to upload a copy of it for investigation.
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.
Here is a world that demonstrates breaking nether portals, beds, grindstones, and cocoa pods on chunk borders with block placement commands.
Automatic chunk border break.mcworld
Here is the world where I rebuilt Wayne's setup and reproduced the bug a few times by setting render and sim distances to max and relogging. Today, however, it is not cooperating.
Portals test & Despawn.mcworld
It seems that the reason I could not get the portal to break again in my previous comment is that I had reduced my Minecraft window size in order to try to capture a video of it happening. Reduced window size must reduce the processor or RAM access enough that there is not enough delay between chunks loading to break the portal. Today I reproduced the break again in full-screen mode with render set to 44 (my computer's max). World sim distance was set to 4. You'll notice in the video below that I have a lag machine running in the chunk where the portal breaks (lots of items perpetually moving in a circle), however, this lag machine was not enough to trigger a portal break with Minecraft running in a small window.
Computer specs:
Intel Core i5-6500 3.2 GHz
8 GB RAM
NVIDIA GeForce GTX 750 Ti
Are there any known workarounds to the issue?
If it is a chunk border issue, possibly the error only occurs when a portal is placed across chunks. Would a portal placed entirely in the same chunk NOT experience this problem?
And if so, would this be true only if the obsidian blocks are also in the same chunk, or would it apply to only the portal blocks?
@Johan Verstergaard Paulsen: yes, a portal that does not cross a chunk border will never have this problem. If only the obsidian of one side is across a chunk border then I think the entire portal could break.
Can confirm this as its happening to my big portal the entire time.
a single block update can fix this when you relight the portal