[MC-46858] Witches no longer spawn in huts

Game world created in 1.7.2. Witch hut trap created and completed in 1.7.4.
In snapshots 14w03b and versions prior to this, the witch hut just spawns witches at the expected optimizable amounts, with the very occasional spider and skeleton (<1%).
Starting from 14w04a, and snapshots since then up to most recent (14w05b), regular hostile mobs spawn in the trap, with witches at the default very rare amount.

Linked issues

is duplicated by 2

MC-46916 Witch huts not saving after update Resolved

MC-71180 New generated witch huts are currently not spawning witches Resolved

relates to 1

MC-15547 Structures (witch huts, nether fortresses etc.) don't get saved with the world file Resolved

Comments 17

fienxjox 2014-02-01T06:55:55Z

What world seed and coordinates are your witch hut (now trap) at?

fienxjox 2014-02-01T07:13:02Z

Update: Tested on my own witch farm which seems to confirm this, but when testing a witch hut in a freshly spawned world (14w05b) I only see witches in the hut, although rarely it seems.

Digger 2014-02-01T08:42:55Z

seed:1596449327583915174
Hut: 1812. 71. -460

I created a new map with the latest snapshot for the same seed - the hut is still there, so this isn't simply a matter of terrain gen changes that seem to happen quite often (check out older maps with newer minecraft versions, and deserts turn into snow biomes etc), but more like the change at 1.6.4 (iirc) where existing structures' metadata was changed (and we were warned repeatedly about that at the time, but not this time it seems). Maybe my analysis is incorrect, but if this is a 'feature' and not a bug, it's infuriating that this hasn't been listed in the changelog.

fienxjox 2014-02-01T16:22:01Z

Or perhaps some additional rule on spawning such as slimes spawn rates changing based on moon phase? Hopefully someone will have an answer, I'm holding off on continuing the parameter of my witch farm until we figure out one way or the other.

Russell Lai 2014-02-01T16:57:28Z

I can confirm this. I created a world using version 1.7.4 with the seed -3784590470294277123. At (-448,-1472) there is a witch hut. After updating to 14w04b (or 14w05b) zombies, skeletons and spiders start spawning in my witch hut (farm).

7 more comments

fienxjox 2014-02-01T21:41:09Z

Continued testing update. I went to an unused witch farm in my upgraded world (created 1.6 and upgraded throughout) and watched it in creative mode. I added some command blocks nearby on a rapid redstone timer to kill all hostile mobs except witches to give them an increased chance of spawning. What I found was only witches spawning inside of the hut, but at no higher spawnrate than random. About a 60 second run of insta-killing other mobs only spawned ~10 witches in the hut, and more than that in the wider area. There were no non-witches spawning in the hut but there were on top of the hut which I believe is contributing to the spoilage in dual-level farms. I ran the same test on a witch hut that was on new terrain generated by 14w05b (found using amidst) and received the same result.

I cannot run an equally comparable test in 1.7.4 as I can't use command blocks to constantly purge other entities, but I think everyone has enough testing on their existing farms / huts to know how it previously worked.

Russell Lai 2014-02-27T17:32:41Z

Still not yet solved in 14w08a.

Doywan 2014-03-06T18:34:59Z

I had the same conclusion has Fienjox. My hut generated in 14w08 (-5483930890225577113, -1904 -1312) spawn witches in every floors except for the one below the roof. This layer of the hut spawn regular mobs like every block in the swamp. If i revert to 1.7.4, this layer spawn only witches again. 14w10 didn't fix it.

Doywan 2014-03-19T05:56:15Z

No news at all ?

Digger 2014-03-19T23:52:53Z

No change in latest snapshot. Witch farm trap still spawning all manner of mobs. Still disappointed, but not surprised.

Digger 2014-05-01T03:50:18Z

Ditto for 18a.

Digger 2014-07-09T20:42:23Z

Still an issue w/ 28a (for the brief time the game ran before crashing)

Digger 2014-07-31T04:58:17Z

Still an issue with 31a, which was meant to solve the problem.

Digger 2014-09-09T23:32:20Z

1.8 still an issue. Tried moving the bottom layer up one and then 2 blocks, but it still spawned all hostile mobs.

Digger 2014-09-10T00:26:48Z

http://i.imgur.com/mvPmomp.jpg
This is a screenshot of NBTExplorer. It has <MAPNAME>/data/temple.dat/data/Features/<RELEVANT WITCH HUT> folder open
Changed the entry reading 73 from 68 for both BB: 6 integers (not sure if both needed). The lower layer of my existing farm is at 73. Now that layer spawns witches only. Top layer spawns all mobs. No other entry causes only witches to spawn on both layers.
This was worked out from reading some comments in issue MC-58363

kumasasa 2015-11-20T22:45:33Z

Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

user-f2760 2017-02-14T15:12:19Z

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.