Mineshafts generate by overlapping each other.

i do not believe mineshafts are working correctly. I understand that they are rarer now but there is definitely something going on. I opened our realm world in creative and tried everything and could not find a mineshaft other than the than the first one I found using locate. . This is a world that has 4-5 people playing on it for hours each day. We have explored many many maps, I don't see how it's possible that we have not found a mineshaft. We have fully explored 100's of large caves. I even spent about three hour exploring further and didn't find one. Either they are so rare now that no one will ever find them or they are generating wrong. Can anyone confirm finding a single mineshaft in survival on Xbox since better togeather on a world generated on better togeather, not a converted world.

I'm not sure how I got confused, thinking you were coming from Xbox. At any rate, if you can't /locate a new abandoned mineshaft even after exploring, and others are having the same problem, it's probably a new bug. I'll try creating a new world to see if my results are the same and get back to you.

Can reproduce on Windows 10 in 1.2.3.6.

I created a test world, /located a mineshaft 2000 blocks south and a little west, so I went northeast a thousand blocks to get farther away from it. Then I started flying around trying to /locate another one. 6000 blocks later, /locate was still telling me the closest one was the one near the world spawn. So either mineshafts have become very uncommon, or they aren't being generated from just flying over. I had no trouble finding villages and even found a jungle temple, but no more mineshafts.

Thank you for testing and sending in your results. ^^

I hope that the mojang team will fix the mineshaft bug in the next release.

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).

thank you very much ^^

I have tested this through a brand new world in the better together and found at least 4 mine shafts inter connected within 1000 blocks of spawn - not to say its a bad thing, but there is at least 4-5 potential triple spider spawners within 16 blocks of each other. the biggest problem with this kind of lay out is that it is really easy to get disorientated and lost so i most likely will jump in there with a haste 2 beacon and clear it all out so i have a bit of direction (that is if the looting 3 bug gets fixed)

Found the same thing on MCPE-26880 that l posted. If you look there you will see the odd formations that the mineshafts are making. Hope this helps 👌 good luck fixing the bug!

I have some potentially helpful information regarding this bug.

First, it affects both Mineshafts and Gold Mines. In some cases, Gold Mines will be duplicating the exact same way as the Mineshaft below so it seems they are tied in some way.

Second, when I put on an xray texture pack, I was able to see the Mineshafts are duplicating themselves in diagonal rows of 4 and the rows duplicate for while. Usually a few hundreds blocks. However, someone found a seed that is very popular called BewitchedCurse where the Mineshaft duplicates forever from under the Woodland Mansion at 375 14 328 to the very edge of the Farlands(now an ocean) at 128550815 15 128550812.

A single Mineshaft have only a single large square room with the floor made of dirt. Assuming these dirt rooms are what Mineshafts generate outward from, i have coordinates for how Mineshafts seem to be spawning. Here are the coordinates for the bottom left corner of the dirt rooms in one of the diagonal rows of 4 that they spawn in: 377 14 325 | 361 14 341 | 345 14 357 | 329 14 370

Each row and Mineshafts are identical to each other. The first Mineaft of the next row after the one I listed is 441 14 389 which shows the rows are spawning exactly 64 blocks apart in the X direction and Z direction. I show all this in the picture called Seed_BewitchedCurse.png that I will attach to this bug report.

Hope this helps!

Edit: To help with debugging, Here is the xray texture pack I used:
http://www.mediafire.com/file/e7yogushudosi10/XrayForUndergroundWithDirt.mcpack

And here is another version but with Dirt being invisible so you can follow the Mineshafts from the surface. However, You won't be able to see the dirt rooms with this one:
http://www.mediafire.com/file/1i25xsiyqc1dsp4/XrayForUnderground.mcpack

Not fixed in 1.2.10 build 1. Mineshafts still generate in one place making them both rare and messy.

Seed: -340659009
Coordinates: 2515 30 -172

For beta build 1.2.10
-------------------------------

It is indeed not fixed, but there is a lot of progress.

I have tested the beta build and found out that the mineshafts are indeed spreading over the world again, sort of.

But the mineshafts are still generating within eachother, which makes mineshafts still a little bit messy.

The mineshafts are alot rather than they should be. But there is more than 1 this time, which is good progress

Reopening ticket based on the comments so far. It seems that mine shafts can now be found in more than one place in a world, but they are still generating as overlapping structures, and spreading too far.

Just tested my seed BewitchedCurse on 1.2.10.1 and this bug is still an issue with no progress made at all. The Mineshaft under the Woodland Mansion still generates exactly the same and duplicates itself just like in 1.2.9. The Mineshafts is still just one connected mass of overlapping diagonal rows of 4 mineshafts that repeats onward to infinity (stops at the very edge of the world at 128550815 15 128550812.

See my massive comment above for more technical detail about this bug.

Still an issue in 1.2.10.2

still not fixed in 1.2.11

Added a new image of the mesa showing 5 earth minshaft centres with absolutely no mineshafts generated along with them. 1.2.11 iOS

This Bug still existing in the new betas (1.5.0.7)

The overlapping mineshafts cause so much lag on some devices that they can sometimes heat up or crash the game. That much lag causes to reduce fps by 12 or lower. It's even worse if there's lava next to the much generated wooden planks because fire will spread for a long time. Even the fire in the mineshafts are creating a lot of lag. I think they should be a little changed/customized somehow, because they are not generating like that in the java edition for sure.

Still exists on 1.4.4.0 and beta 1.6.0.1

I believe I know the reason why they are overlapping/duplicating eachother. Maybe when the player desperately tries to find a mineshaft the game tries to generate it but there may be an error preventing it from doing that (maybe some sort of chunk error?). And then finaly when the player finds a mineshafts where the game  could find a place to generate a mineshaft (without an error) it will generate a mineshaft, but also all those mineshafts that failed to generate. Maybe all the times that the game tried to generate a mineshaft but failed it counted how many times it failed? And when the game can generate one mineshaft also ads the number of errors and duplicates the mineshaft.

This is my opnion, I do not confirm this to be the case.

But in any way, this must be fixed!!

@Damir

Sadly, there is no list to hold onto mineshaft that failed to generate. The list of failed Mineshafts would also not explain why the Mineshafts generate exactly the same in rows of a constant distance apart.

Instead, one of my guesses for the cause of this bug is that it's in the MapGenMineshaft class within the canSpawnStructureAtCoords method. In Java, they check two random numbers to see if a chunk will spawn a mineshaft and does it in a way so that Mineshafts spawn more frequently past 80 chunks if I am reading this right. My guess is they replaced this line of code to spawn mineshafts in a new specific way but it is now returning true for chunks in diagonal rows. 

Though this seems highly unlikely due to the behavior of this bug. The only other thing I can think of that is causing this recursion is in the StructureMineshaftStart class, the this.components list might have a second room in it which generates the exact same mineshaft again at the suppose location of the second room. But this would mean the entire cluster of mineshafts would have to generate all at once and so the seed BewitchedCurse should freeze the game with its infinite generating mineshaft bug.  (I'm not sure if that would be true... lol I gotta mess with Minecraft some more and learn how it works)

Simply put, we don't know what code they are using for Bedrock Edition's Mineshafts but hopefully the developers can figure out this strange bug that has survived for many Minecraft versions now.

affects 1.5.1  1.5.2

I confirm that this still affects 1.6.1. Please fix this issue in the upcoming updates, its a total gream breaker when it comes to mind the phone users. I guarantee that there's over 20 Cave Spider spawners generating in this one duplicating mineshaft. Imagine if two duplicating mineshafts spawn very close to each other!? This is a total letdown for a lot of the phone users, especally to the lower-end device users. Please fix this bug in the upcoming update altough I cant explore properly because of the LAG it creates.

This is confirmed this is not fixed either in beta 1.8.0.8

I confirm this bug is still not fixed in the newest beta 1.8.0.13

I confirm that this issue is not fixed in beta 1.9.0.0

According to the latest Bedrock beta, this issue is still not fixed in 1.9.0.3