I have a blaze farm that i recently built in 1.9 pre release 1 and it worked fine spawning blazes.
When I updated to pre release 2 nothing was spawning
I went into creative and placed a whole heap of different spawners and none of them were working.
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ok I did a bit more playing around, turns out it is spawning the mobs... but at the incorrect location, with a pig spawner i placed it and all the pigs are spawning around the correct z coordinate but the pigs are spawning at x = 0 regardless of where the spawner is placed