World was created in 14w26c, then loaded into 14w27b. When moving to un-generated chunks that contain one of the 3 world strongholds, the game crashes. Reloading the game will continue to crash in the area until the stronghold has been completely generated.
After reloading, and once crashing has ceased, the generated stronghold will appear to contain doors (both wooden and iron) that aren't really there. Pressing the button on a wall or placing a torch in front of the doors will result in the door disappearing.
Description: Exception while updating neighbours
java.lang.IllegalArgumentException: Cannot get property azh{name=half, clazz=class aqo, values=[upper, lower]} as it does not exist!
at ayx.b(SourceFile:120)
at aqn.a(SourceFile:156)
at aqn.a(SourceFile:163)
at amp.e(SourceFile:470)
at amp.d(SourceFile:434)
at amp.c(SourceFile:405)
...
-- Block being updated --
Details:
Source block type: ID #0 (tile.air // aon)
Block: minecraft:iron_door[facing=east,half=upper,hinge=left,open=false,powered=true]
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At least related.

Is this still an issue in 14w28b ?
Testing out 2 new worlds in 14w28b, this no longer seems to be an issue.

Ok, thanks.
This could be a duplicate of MC-60193