Wither not spawning
The Wither does not spawn when the Soul Sand block at the bottom is placed last. It doesn't matter if you do it by hand, or use a piston. If you remove and replace one of the heads it will spawn.
Environment
Windows XP Home Edition - Java 7 Update 5 Build 1.7.0_05-b05
Linked Issues
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Created Issue:
Wither not spawning [1.4.5]
The Wither does not spawn when the Soul Sand block at the bottom is placed last. It doesn't matter if you do it by hand, or use a piston. If you remove and replace one of the heads it will spawn.
Environment
Windows XP Home Edition - Java 7 Update 5 Build 1.7.0_05-b05
I tried building one the correct way, in 12w50a and 1.4.6pre, and it didn't work.
...Oh yeah (sorry), I accidentally forgot to mention (somehow) that spawning a Wither doesn't work IN THE END.
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Wither not spawning[1.4.5]
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Duplicate of MC-3780 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.
and
This ticket is invalid as it relates to a modded or 3rd party client/server.
- Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
- Any plugin issues need to be addressed to the plugin creator.
- This site is for addressing issues related to the base unmodded MineCraft.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Duplicate of MC-3780, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
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Duplicate of Works As Intended
MC-3780
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Duplicate of MC-3780
Change the Difficulty

The rule for all buildable mobs is : Build from bottom to top, this applies too for the Snow Golem and the Iron Golem, see http://www.minecraftwiki.net/wiki/Wither
Does that mean you can't spawn one using pistons?
Correct. None of them. All three buildable mobs have to be build by the player.
How sad...
Thanks for the help though.
Building a Wither the correct way works in 1.4.6
I have the same result as Kumasasa.
You sir are on peacefull!
You cannot be on peaceful mode
Are you in peaceful mode? Non of hostile mobs will Spawn in peaceful. Be carfully when try to report na issue!
Just FYI a slight change to this in the upcoming update.
Update: 1.8
Dispensers
Can now place pumpkins or Wither Skeleton Skulls to spawn golems and withers respectively
No hostile mobs except for the Ender Dragon spawn in peaceful mode. You are in peaceful mode.
It is happening to me on 1.16 snapshot 20w21a, and i am not on peaceful mode. (If you are on peaceful mode, and you sucessfully summon the wither, you will see a blink for less than a second and then it will despawn.)