In new Snapshots For Version 1.8 redstone does not work with pistons redstone does not line up with placed next to one another and tnt lags after it is lit.

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Fix the Problem with the Redstone
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What actually happened was...:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... place red stone down next to each other and see for yourself. And when tnt was dispensed it flashed then disapered seconds later blew up. pistons dont react to redstone.
3. ...