When using spawners, the spawner particles often become displaced very briefly in different places.
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For the spawner pictured,
setblock ~ ~-1 ~ minecraft:mob_spawner 0 replace {EntityId:XPOrb,SpawnCount:1,SpawnRange:1,MinSpawnDelay:1,MaxSpawnDelay:1,MaxNearbyEntities:32000,RequiredPlayerRange:10,SpawnData:{Pos:[2.5,102.0,8.5],Age:5999}}
I am using Jesper's XP Item clock. I went into the same world in 14w32a, and I'm still having the problem with every spawner in the world. Sometimes I'll be walking down a hallway and see spawner particles flying about.
I can record, upload, and link a short video of the effect if you'd like to see. I'm not sure I described it well.
http://www.mediafire.com/download/50d595kl9pbg8l1/TARDIS_2014.zip
There are spawners throughout.
Okay after testing, I discovered the bug. Excellent find! It's not about mob spawners, it's about particles in general. They visually duplicate at 0 0 0. I confirmed this with a clock and particle command.. But someone has reported it already. So this is a duplicate of MC-64653 and can be closed. But excellent job on finding that bug. Keep your info updated at the other bug.
Can you input the exact code to setblock the particle spawner?