When you place down a minecart, remove the rail, then place a detector rail underneath the minecart without moving it will cause the detector rail to turn on, but not power anything whatsoever.
Steps to reproduce
Place a detector rail.
Place redstone dust or a redstone lamp next to the detector rail.
Place a minecart on the detector rail.
Break the detector rail.
Place a new detector rail under the minecart.
Expected result
The dust/lamp lights after step 3 and again after step 5.
Actual result
The dust/lamp lights after step 3, but does not light after step 5.
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