[MC-97491] Spawner spawns entities with NBT tags and monster with no Pos tag at wrong position

The bug

Spawners do not spawn entities at the correct position anymore or do not spawn them at all, which might be caused by the fix of MC-90101

Entities with NBT tags

Spawners spawn any entity that has NBT tags other than id but no Pos tag at (0|0|z). This means only their z-coordinate is used.

Monsters

Monsters with no other NBT tags than id an no Pos tag are spawned at (0|y|z). This means only their y- and z-coordinate is used.

How to reproduce

Use the following command

/setblock ~ ~1 ~ mob_spawner 0 replace {SpawnData:{id:"ArmorStand",NoGravity:1b}}

Linked issues

is duplicated by 25

MC-97494 Spawners are not spawning monsters anymore Resolved

MC-97503 Spawners doesn't work Resolved

MC-97516 Monster Spawners not spawning Monsters Resolved

MC-97541 mob_spawner does not work Resolved

MC-97546 Mob Spawner Spwans Mobs in wrong place Resolved

20 more links

relates to 1

MC-66293 Ridable Entities when motion tag is applied is sent below bedrock Resolved

Attachments

Comments 23

Brian McNamara 2016-02-18T22:35:39Z

In a 1.9 CTM map I've been making, I witness mobs only spawning at X=0.

Brian McNamara 2016-02-18T22:36:03Z

all spawns at x=0

Randy Archer 2016-02-19T03:51:20Z

My free food spawners (1 cow 1 sheep) sparkle but create no mobs

Irbis 2016-02-19T09:57:13Z

Seems to be caused by fix of mine bug: MC-90101
Hope 1.9 pre 3 will also fix this one without breaking fix of mine.

SunCat 2016-02-19T13:07:23Z

Armorstands actually spawn at 0 0 Z

13 more comments

Alwin Oposa 2016-02-19T15:44:55Z

This actually broke every spawner in the server where I am.

FargoGamer 2016-02-20T12:48:16Z

I have the same problem, on a Server that I own, none of the mob spawners is actually spawning mobs.

Ozone Smith 2016-02-20T21:01:40Z

Yeah, I've seen this as well.

James Koon 2016-02-21T02:40:56Z

In Pre-release2:Can confirm, no mobs are spawning at any difficulty in any naturally generated spawner (tested Skeleton, Spider and Zombie on both a newly generated world as well as on a pre-existing server).

Cavinator1 2016-02-21T02:51:34Z

Can confirm. Suddenly no mobs are spawning at all with any of my custom spawners in my map.

Nicolas Chan 2016-02-21T05:34:23Z

Can confirm, naturally generated cave spider spawners in a new survival world on my server are never spawning anything despite being in complete darkness.

user-2a4c8 2016-02-21T14:18:13Z

Yep... confirmed on my vanilla 1.9pre-2 server as well

Søren Schmidt 2016-02-21T15:30:39Z

Confirm on pre2. World created in 15w49b and upgraded to all later snapshots. Both skeleton and spider spawner not working.

Hayden Aiken 2016-02-21T22:10:33Z

I can confirm. prerelease two.
I made sure my xp grinder was up to wiki specifications, and I did all kinds of troubleshooting. neither of my zimbie dungeon spawners work. They rotate at the same speed, consistently.

Jakub Nápravník 2016-02-21T22:56:35Z

Yep. It has to be a bug, because in my survival world in Minecraft 1.9 Pre-2 my skeleton grinder with a dungeon spawner does not spawn anything. Hope it'll be fixed before releasing 1.9.

Matthew Hoag 2016-02-24T02:04:02Z

Confirmed. Zombie, Skeleton, Spider, and blaze not spawning in my current map (created originally 1.8.9 and now running in 1.9 Pre-2).

akiva silver 2016-02-24T03:06:49Z

I have been having issues and it was a fresh pre-2 map, i first noticed when i went into the nether. blazes did not spawn and i was on my way to the end.

Hugo Farías 2016-02-24T03:09:57Z

It isn't fixed. In my world (created in older snapshots of 1.9 and now running in 1.9 Pre-2), i tried to build an xp farm with spawner and skeletons (in my case) doesn't spawn. The bug fix will be added in the next snapshot or what??

QwertyuiopThePie 2016-02-24T03:30:19Z

It says fixed in "future version", not now. So, yes, probably the next prerelease, or the main release.

akiva silver 2016-02-24T05:13:41Z

I would think they would patch it in a new pre-release. Just incase if that patch introduces a new bug

James Koon 2016-02-24T10:28:18Z

@akiva silver You would think, but considering they're planning on releasing tomorrow... there are quite a few other bugs that have yet to be resolved as well...

user-f2760 2016-02-24T10:33:20Z

@unknown

UPDATE: the release date was moved to Monday, 29th of February 2016

https://mojang.com/2016/02/minecraft-19-pre-release-1/

SunCat 2016-02-24T18:08:52Z

Confirmed the fix