Giant spawner don't work.

// Description of the bug :
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The giant spawner don't work, i'm sad because i can't spawn my
giant :\.

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// How to produce :
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1/ Allow to you a spawner (/give @p 52 1).
2/ Place the spawner.
3/ Go to MCEdit/NBTExplorer/Other to edit the spawner for it spawn giants.
4/ Go to the game and set the time to night (/time set 20000).
5/ See, the spawner don't work for spawn giants.