When one Minecart pass, Detector Rail will active and send signal to piston(with NOT GATE), so the Rail will be shifted to the next block.
But though I've removed the cart, the signal didn't dissapear. So as seen in the picture I posted, piston won't go back its position. (Even after I removed Detector Rail, It doesn't dissapear)
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34th duplicate of MC-5788, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.