When you place a block, place a detector rail sloping onto that block, a dispenser on that block facing the detector rail, and a repeater next to the side of the block, the repeater stays on, causing certain circuts to become imposible, like one to see if a minecart actually came out of the dispenser.
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Duplicate of MC-5788, please use the search function to see if your bug has already been submitted. Currently over 40% of tickets are being closed as duplicate.