place a tnt block
place a redstone torch 2 block under the tnt
place a block on top of the torch
the block is powered and it touches the tnt, but nothing happens
(the torch on the pic is a redstone torch)
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[media]

Confirmed in 1.4.6 and 13w02b.

Confirmed, as long as you put the block in last. If you put in the torch last, it works normally.

Duplicate of MC-266, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.