Note
If your affected spawner sometimes works, or starts working again after you reload the world, or shows a mob spinning but just doesn't spawn anything, then you do not have this bug. Those behaviors are tracked at MCPE-142285.
This bug report only applies to spawners that never work and never show a mob inside.
Steps to reproduce
Create a world without Caves & Cliffs experiements, with seed 648853.
/tp 16 80 291
Save & quit.
Enable Caves & Cliffs experiments in the world settings.
Load the world and /tp 16 -43 291.
Expected result
The spawner at 16, -43, 291 has a zombie spinning in it and spawns zombies, and the chests in the dungeon have loot.
Observed result
The spawner at 16, -43, 291 has nothing spinning in it and does not spawn anything, and the chests in the dungeon cannot be opened and drop nothing on breaking.
I found a cave spider spawner inside a mineshaft I lit it with torches to stop them from spawning and left the mineshaft I went back to get some EXP so I removed the torches and the spawner appears as if it's empty it has no mob spinning inside nor does it have the usual flame effects and nothing is spawning from it. When I remove the torches the light level should be enough for them to spawn and there should be a cave spider spinning inside the spawner
Related issues
is duplicated by
MCPE-136317
Cave Spider Spawners in Mineshaft appear to be missing spiders
MCPE-145255
Spawners generate blank
MCPE-149349
Found an empty spawner!
MCPE-149409
Monster Spawners In New Caves With Mineshafts Spawning Empty
MCPE-149440
Dungeon with 1.18 blending causing empty spawners.
MCPE-149681
Mob spawner
MCPE-149686
The Spawner does not contain Mobs
Attachments
Comments
migrated
migrated
What do you mean by "it's empty"? Like it has no mob rotating inside? Did you wait to see if anything spawns from it?
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migrated
I will revise the description on my report but yes there is no mob spinning inside and not particle flame effects either
racartwright
I experienced this same problem on a BDS world. A copy of the world can be found here: https://www.dropbox.com/s/3fwf4uzvo6yziln/ClassSMP-trim.zip?dl=0
This was was created last week in 1.17.34. When 1.17.40 came out on Wednesday, I upgraded the sever and enabled the Caves-N-Cliffs experimental toggle. Over the weekend, I noticed that many of the mobs spawner's nbt data had missing `EntityIdentifiers`, and thus have no entity spinning in the mob spawner and don't spawn mobs when the player gets close.
A table of all locations of mob spawners in this world is attached if anyone needs to visually inspect the world:
[media].
GoldenHelmet
This bug is caused by upgrading chunks generated without the Caves & Cliffs generation to the Caves & Cliffs format. When the game generates new blocks in already existing chunks it does not add tile entity data to those blocks. Probably this relates to the chunk upgrade algorithm reading the pre-existing finalization state of the chunk, instead of setting its own.
[Mojang] Mega_Spud (Jay)
This bug should be fixed in the latest beta version, and the fix will be included in a future update when that is ready for full release (no specific date can be given). We will leave this ticket open as a point of reference until the fix has been fully released.
GoldenHelmet
Reopening as we are getting reports of this after 1.18.0, starting with MCPE-149349.
migrated
It happened to me in a different way. I play on servers such as those that are not important, I created a server in 1.18.0 I went mining and I found a skeleton-type mob spawner that was working with the mob spinning. then I found another spawner hidden in the water I went to see what type it was and it had no mobs spinning or fire around but if it generated zombie mobs, the weird thing was that I generated a villager zombie and also normal zombies that was weird to me Then I killed it and reported it in bugs mojang I put lighting so that it did not generate any mob then I closed the world and reopened it and there was if the mob appeared turning zombie type with flames around it.
GoldenHelmet
Timer RP Oficial: zombie spawners have always spawned zombie villagers in Bedrock Edition: see MCPE-91436.
It sounds like you experienced MCPE-142285, not this bug.
migrated
same here, 1.18 has this bug, 1.17.40 no problem
i have bedrock server
GoldenHelmet
I found a spawner working correctly at Y = -24 in a chunk I know for sure was generated prior to 1.18, in a world that had never used C&C experiments. So from what I can tell the bug that was tracked on this ticket is indeed fixed.
It is possible, however, that there might be issues with upgrading chunks from older versions, or previously generated spawners in chunks that had never been altered. Does anyone have a spawner that has not worked at all since 1.18.0 in a world that did not have C&C experiments enabled before updating?
GoldenHelmet
If anyone has an issue like I described in my previous comment, please create a new ticket with steps to reproduce the issue. I am resolving this one as Fixed.