Steps to duplicate:
1. create a little powered rail track (leave unpowered)
2. in the track, best in the middle, break a piece of the track, put a block in its place, and put a detector rail on top.
3. update the powered rails
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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.