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Bug
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Resolution: Works As Intended
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None
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Minecraft 15w34a, Minecraft 15w34b, Minecraft 15w34c, Minecraft 15w34d
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None
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Windows 7 64bit, Java 8
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Unconfirmed
This is a problem because chain can be changed during execution and expectation is that the changes made should be accounted in the next tick.
Examples are in attachment.
This 
screenshot shows workaround with using setblock clock.
I'm not sure that this isn't intended but it is certainly not expected.
