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MC-89923

No AI Mobs from Natural Mob Spawners

After starting a world in creative, I had happened to spawn next to a dungeon. After entering, I noticed a massive amount of Skeletons floating about, and they're even spawning in sun light. I'm unable to hurt them more than once.

Related issues

MC-89925 skeleton spawner under sand spawns mobs that don't die or move MC-89966 Zombie spawner spawns chicken at higher light level MC-90069 Invisible baby zombies riding chickens from spawner MC-90114 Floating Mobs Coming From Spawner MC-90136 15w41b Dungeon Spawner Desert MC-90184 Skeleton Multiplication MC-90193 Skeletons no AI MC-90195 Skeleton Spawners create huge lags. It keeps spawning Non moving Skeletons and there will be like 50+ in a spawner room, which made my fps go down from 200 to 11. MC-90218 Strange spawner behaviour MC-90230 random skeletons stop moving/attacking, and don't burn in daylight MC-90239 Mobs spawning from incorrect monster spawner MC-90262 A mob from the night stays through they day, does not move, and can only be attacked once. MC-90300 Fake Spawning in spawner MC-90324 Wierd Glitch with spider spawners MC-90328 The Skeleton Mob at one point in the morning froze, didn't attack and stood there. MC-90335 Spider spawner spawns a bunch of AI-less skeletons MC-90344 Jockey mobs spawning in regular mob spawners MC-90413 Non moving skeletons. MC-90433 Skeletons duplicating MC-90440 Zombie spawners spawn chickens at normal light level, on wooden planks MC-90445 Non-responsive skeletons and broken spawners MC-90453 Glitched Skeletons Spawn From Spider Dungeon Spawner MC-90463 Hostile mobs (skeleton) stationary in air MC-90486 Spawner Bug MC-90505 Skeleton "Statues" MC-90509 Mob spawners not working MC-90514 Skeleton spawning at Spider spawner rapdily MC-90517 skeleton spawner turns empty( not found empty, turned empty) MC-90532 Spider Spawner creates Skeletons when deactivated with torches MC-90533 Mob Spawner, immobile skeletons in peaceful. MC-90540 skeleton frozen in place MC-90542 Dungeons not spawning the correct mob MC-90559 Spider Spawner creates hundreds of phantom skeletons. MC-90561 Zombie Spawner spawns chickens and baby zombies even when not supposed to MC-90743 Indestructable Skeleton MC-90886 Skeletons are sometimes unresponsive. MC-90957 Skeleton (and more hostile mobs)is still at peaceful MC-90992 Skeleton isn't burning in sunlight, floating and can only hit once. MC-91013 Skeletons not burning in daylight

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[Mod]Les3awe

Confirmed

[Mod]Les3awe

This issue relates to MC-88646

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No AI mobs from ALL natural spawns, it seems...?

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I came here because of a Skeleton that doesn't react, and I'm pretty sure that spawned outdoors at night. I hit it once, then could not affect it again. I dug all the dirt out from underneath it and it didn't fall. Seems like the same issue.

I have found, fought, killed and been hurt by other monsters near here. It's not all the monsters in the world, but it has been a couple.

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I've come across this bug in my hardcore world. I found a spider dungeon, looted the chests, and when I turned around there were several floating skeletons. Once I managed to push my way through them, I looked back and saw that more were constantly spawning.

Irbis
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It might be related to https://bugs.mojang.com/browse/MC-90101

That seems unlikely.

What appears to be going on is that spawning of entities with passengers is screwed up. For example, when the spider spawner is lit it will be trying every tick to spawn spiders, but none of these spiders will be able to spawn because of the light levels. 1% of these spiders, however, will be skeleton jockeys, and apparently the skeletons wind up being half-placed in the world (there, but not in a way that they'll be ticked or saved) even though the spiders themselves aren't.

It's likely the same can happen when a natural spider jockey tries to spawn. Being able to hit the skeleton once then not again is likely because the one hit sets the temporary invulnerability which never goes away because the skeleton isn't ticked.

Zombie spawners seem similar but different: chicken jockeys will spawn the chickens, while the baby zombies will not be correctly added to the world but will be saved. Logging out and back in results in these babies being properly added to the world. The difference is probably because here the zombies (rider) are spawned first then the chicken (mount) is added, while for the skeletons it's the spider (mount) that's spawned first then the skeleton (rider) is added.

Irbis

@Anomie X, now i see. Thx for explanation.=]

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They also spawn in peaceful mode, and when you run /say @e[r=5], it says Username and skeleton.

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i dont see why my ticket got a duplicate from here...its not even the same bug... might be related but its not the same thing at all
ok now i just checked and my zombie sapwner is empty too...

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I am seeing this behavior in snapshot 15w41b. Skeletons appearing around a spider spawner.

SunCat

Jeff, this bug was first found in this (15w41b) snapshot, already confirmed and will be fixed in future version.

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I am not sure, but I think it still exists in 15w42a. Or at least something similar is happening in 15w42a.

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WesselH: Screenshots (with the F3 screen) and steps to reproduce, please.

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Hmmm...

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Looks like its fixed in 15w43a/b

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I also can't find a "dead" skeleton anymore in 15w42a

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This error is occuring on 42a .. however im testing to see how it goes on 43b

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In 43b there was a no AI skeleton that spawned, albeit naturally

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I encountered one skeleton with no AI, but it spawned naturally as well. I managed to hit him once, then he froze.

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Attached image 2015-10-25_03.09.31.png is on 43c. I'm thinking this isn't really fixed yet. Hit this skeleton once, then he froze.

SunCat

@unknown and @unknown, were your worlds opened in any version before 15w42a? Because if they were, the NoAI skeletons could spawn and stay there until you found them in this version, or it's actually a different bug.

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SunCat, yes, I've been updating this world for each snapshot, so the world was open in an earlier version. That being said, I was quite far away from this area, so I believe it was a fresh natural spawn. I say "believe" because I'm not certain. After quitting Minecraft, the skeleton is no longer there when I reopen the game. This could definitely be a separate issue, or already fixed. I'll keep watching to see if it happens again.

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If you find new information, please comment here: MC-91290

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Nathan Adams

Confirmed

Minecraft 15w41b

Minecraft 15w42a

Retrieved