Witch Huts / Witch Traps spawn other mobs

Still an issue in 14w28b, screenie attached.
Still an issue in 14w29b, screenie attached. VBO On? Notice FPS? Meh.

Also in w29b

Just attached a world to make this easier to verify – if loaded in 1.7.5, the spawning platforms only spawn witches, but if loaded in 14w29b they spawn other mobs too.

same in 14w30b

Concur. No fix in 14w30b
No fix in 14w30c

Great news! I'll check it on release!

Fix in 14w31a confirmed. 🙂

Not fixed completely for me... Only witches spawn but the rate at which witches spawn is incredibly slow. Averages 1 gang every 3 minutes. My trap has all caving done and used to spawn hundreds of mobs in no time. 14w31a

1.8 removed LC values, and now treats everything as if it had an LC value of 255, so that decreased the efficiency of all witch farms.

Not fixed at all for my 1.7.2 witch farm, reported in MC-46858. Farm still spawning all hostiles.

Well it's strange then, because I get decent rates and only witches. Certainly not one gang every 3 minutes. The farm does feel slower because the game checks the higher chunks but... it looks fixed to me... Maybe it's a matter of the structure losing it's properties in certain worlds if it's been loaded in a certain snapshot before?

Screenshot attached. Will post video eventually.

Not fixed at all for 14w31a, other mobs continie spawning but less agressive than before.

Reopened (Comments here and MC-64764 )

I can't reproduce this in 14w31a, within the witch hut area only witches spawn. It's of course still possible to have other mobs spawn next to the area and then walk into the witch hut area.

Witch farm in 14w31a is still spawning all sorts of mobs.
Is it possible that loading the hut location in 14w30c and lower has permanently corrupted the spot?
Is it possible the problem isn't completely solved?

@@unknown: You can find it out by restoring your pre-14w25 / pre-14w11 / 1.7.10 backup or by recreating the world in 14w31a.
On the other hand you may provide the seed and the coordinates of the witch hut so that others may have a look into.

After Cropping off the end of my world containing the witch farm, re-flattening a bit of land, and making rudimentary pads to check spawning, all types of mobs are still spawning.
Chunks were regenerated in 14w31a.
Should this not have fixed the problem? Would really prefer not to lose all progress in our survival world since the 14w25 snapshot

The same thing happened to me – having loaded the world in 14w30 (which may or may not be related), the farm still spawns other mobs in 14w31a. I'd say this should be reopened – it still seems to be an issue.

If the above commenter was correct, and loading the farm in 14w30 "corrupted" the farm, can someone provide more technical information on what was corrupted? I don't want to lose all my work since then, so I might do something with MCEdit to "uncorrupt" the area.

Actually, forget what I was saying about "corrupting" a hut – in fact, the bug still exists even if the hut is only loaded in 14w31a. Load up the attached world (in WitchSpawnBug.zip). You'll see two platforms made of iron blocks (coordinates (672,100,-2320)). In 1.7.10, both platforms only spawn witches, but in 14w31a the top platform can also spawn other mobs.

Incidentally, in 14w30 both platforms could spawn other mobs, not just the top one, so it is clear there has been some change, but for some reason it only affects the lower part of the bounding box.

Just curious is the bounding box of the witch only area going to be fixed, or is it permanently 1 block lower and smaller now?
I hope this issue is re-opened for resolution. There are still spawning issues with the huts.

Could someone please reopen this? It's clearly not fixed – if you look at the attached world, other mobs spawn on the top platform of a farm.

Confirmed for 14w33a.

Look, I don't mean to spam everyone's inbox, but can someone please reopen this? It's not fixed, and it would be a shame for 1.8 to come out and have everyone's witch farms break.

The witch farms are fixed.

Block placement of a witch farm is imperative. You have blocks OUTSIDE the "witch only" spawning area which allows other mobs to spawn. Watch a video again that makes the farm from the hut. They explain exactly where to put the blocks.

I knew right away that your block placement was off because the pads were too big and the gap between the lower pad and upper pad was 3 high.

Witch huts have always always had a 9x7x5 bounding box. This means that you can build two 9x7 platforms, at a maximum of 3 blocks apart from each other. If you load the attached world in 1.7, it'll only spawn witches.

Still exists in 14w34a.

Affects version 13w34c.

I've done some further tests on the attached world in 14w34c. It seems that the game considers the "hut" to have a smaller height than it should. Only witches spawn at y=66, y=67, and y=68, while other mobs can spawn at all other heights. The witch hut is two blocks shorter than it should be; it should range between y=66-70 (as it did before the bug existed), rather than between y=66-68.

i have found the same thing as chocolatechip and would like this issue re-opened. the issue was patched but clearly isn't fixed. If this was an intended change it would be nice if it was at least made known.

Well, it has been reopened, but who knows whether it'll be fixed with a prerelease probably coming out tomorrow.

In the Temples.dat NBT file, there's a <BB> node at the top level for the whole structure and a <BB> node on each child piece of the structure. For the hut in the attached zip, these differ in the Y coordinates.

Glancing through decompiled code for 1.7.10 and for 14w34d, the issue seems to be that in 1.7 it ignored the Y coordinates on the outer <BB> tag while in 14w34d it's checking it when matching the spawn coordinate against the bounds of the structure.

So if I understood correctly, this would essentially corrupt any witch huts generated before 14w25b, when analyzed according to the new system (which doesn't ignore the y-coordinate on the <BB> tag).

There are a few possible fixes to this. The first would be to go back to the 1.7 method of processing which huts – while inelegant, it wouldn't break all the old farms. (As Mojang showed with 1.6.3 awhile ago, keeping old farms intact is clearly a priority.

The other way would be to build in a workaround, similar to 1.6.3, in which old huts can be identified and have their internal data fixed.

Note that witch huts first generated in 14w34d have the same Y-coordinate situation. So it's not just old huts.

Affects version 1.8-pre1.

Hey guys thanks a lot for bring up the BB tags. So is the consensus this isn't a bug, That the BB tags y cords were never suppose to allow 2 floors of spawning?

Anyway I was able to edit my Temple.dat and increment the last set of BB tags bounding box height by 1 to fix my farm, two witch spawning floors in 1.8-pre1 !

In the picture, all I did was increment 68 to 69. FYI for anyone!
http://imgur.com/eKxYOac

Edit: 1.7.2 generated witch hut.

I'd still say this is probably a bug – witch huts have been able to have two spawn floors for almost two years. While this may have been the result of a coding oversight initially, it's a bit odd that Mojang hasn't addressed the issue at all. From a player's point of view (oblivious to the internal BB tags), the farms have simply changed with no explanation or (apparent) reason, and so pending an official confirmation I would consider it an issue, and not an intentional nerf.

I'd say the real bug is that the BB tags are being generated improperly.

No, it's not intentional. It seems that many structures are internally generated at a constant Y level and then moved up or down to fit the terrain. If some part of the moving is skipped but doesn't cause any major issues, it's unlikely to be fixed (e.g. MC-954).

Also, it's (probably) possible for a witch hut to generate at such an elevation that there would be no overlap at all in the Y coordinate ranges.

Just wanted to extend a thank you to "Anomie X" and "toastonrye" for actually honing in on the latest patched Witch Hut bug (debacle IMO, really tired of these). I've been searching for the reason behind this for weeks and almost just quit playing the game over it and several other of the nerfs (thankfully which were reverted). I knew I should have dug around here more.

I don't mind having a farm slowed down a tad- that's fine- I just want it to work correctly like I designed and for all my hours not to be spent in vain. No one would like having their castles torn down or manual farm fields rendered completely obsolete. This is the second time I've had to manually crack into NBT to fix what Mojang should have got right the first time and I'm usually the type of player that won't even touch the difficulty button let alone edit anything. It was agony fixing my hut this way the last time it was erased in 1.7.

Also what I actually did to properly make it work again was copy ALL of the topmost/inner <BB> set coordinates directly over the incorrect ones in the outer/bottommost set, and it immediately ran flawlessly albeit a bit crippled of course due to the new LC change.

In 1.8 Pre-3 My witch farm (from 1.7.10 directly) (originally generated in 1.7.4) spawns non-witches on the uppermost floor (at y=71, lower is at y=67 - Swampland M), suggesting that this issue remains unfixed.

1.7.10; spawning pads at y=67 and y=71 in swampland M. Witches spawn on both pads, no other hostiles spawn on these pads.

EDIT: changed y=68 to y=67

1.8; identical situation to previous screenshot - same world, same conditions. Pads are located at y=67 and y=71, however, all hostiles can spawn on the top pad while witches only spawn on the bottom pad.

EDIT: changed y=68 to y=67

The attached "example world" can be switched from 1.7.10 to 1.8 and back to demonstrate the bugged spawning behavior explored in the above screenshots. Searge, hopefully, this can be used to assist you to figure out the problem and resolve this issue.
NOTE: The perimeter was made in less than 5 minutes in MCEdit and is hence, no where near perfect. To get mobs to spawn, one might have to switch from hard to peaceful and back again.

However, it is interesting to note that on THIS ["Witch Farm"] world, originally supplied by Redstone Spire, wherein the spawning pads are located at y=64 and y=68, ONLY witches spawn on BOTH floors in 1.7.10 AND in 1.8.

I hope that my resources can be utilized to find a solution to this issue.

I build a witch farm in 1.8 release, and it started spawning all kiind of mobs, then i researched and I so this, so I thought it was ok, but not i has just stop spawning ANNY kind of mob. It's in total darkness, and the surface is made of hoppers, and it dont spawn any mob, i checked game difficulty even gamerule domobspawning, but it dont spawn anything at all, i used a copy of the world to fix it, but i thought that this bug may fit in here

The old behavior (before 1.8) was bugged, due to a general bug fix for bounding boxes the witch hut now works as intended.
To make it a bit easier to build a witch farm, I raised the height of the witch spawn volume by two blocks, so it's now Y 64 to 71.

@Searge: I find it hard to understand how you can close this as "works as intended". It's intended that with huts that spawn with their floor at Y=65 spawn only witches, while huts that spawn on top of a hill will spawn other mobs? That makes little sense.

I'm also unclear on whether you actually fixed the bug (that the bounding box used for the hut doesn't match where the hut was actually generated) or whether you merely increased the height of the incorrect bounding box so the hut has to spawn on top of a bigger hill for the bug to be noticed.

Ooh, three spawning pads! 🙂

To be clear, will this affect existing huts, or are they "corrupt"?

@Anomie X: I believe witch huts always spawn at the same level.

@ChocolateChip Cookies: Existing huts already have their data written to the save file, so they are likely corrupt, as you put it.

I don't understand how this can "works as intended".

I would like clarification too, I built my farm around a hut with a floor at y=73 but I fail to see how this positioning is bugged and required fixing. Now in 1.8 both floors of my farm spawn all mobs and to say it works as intended just feels like a cop out with a bodge to appease the majority

I don't think this is a solution, as i did it myself using nbtexplorer annd for my hut it did not do anything, so I won't say it works as intended... please make a real fix on this as its a pretty important bug that affects a lot of people in their survivals, for example I've stopped playing mine for a month as I need tons of redstone that I cant get, please fix this, an ACTUAL fix

So, Searge. you're telling us that ONLY witch huts within your new "fixed" bounding box spawn witches, meaning if we find a hut that is higher of the ground than normal, we can't convert it into a farm. THIS ISN'T A FIX. After having spent 10's of hours spawn-proofing my perimeter to have my farm "fixed" to only have one working floor is more than a disappointment, to say the least.

1.8 pre-3 spawning other mobs

1.8 pre-3 confirmed to spawn other mobs
seed:
109846752
cords:
-2032 70 1568
pictures:
http://imgur.com/7wc5Lcy,NV1kOeG,nUcPo8x,DtumHez,CTp9h6o,wS2ahUG

Please reopen this bug T_T

See MC-73051