Detector rails are stuck powered after the chunk unloads.

I have several designs where I use a detector rail to stop a hopper minecart in place while it is empty, then it gets sent on its way once full. These designs break if the chunk ever unloads.

How to reproduce

1. Create a superflat creative world.

2. /setworldspawn 0 0 0

1. /tp 199 ~ 200

1. /setblock 200 ~ 200 minecraft:detector_rail
   /summon minecraft:hopper_minecart 200 ~1 200

1. f3 and target the detector_rail, it will show you that the detector_rail is powered
2. destroy the  minecart
3. the detector rail will switch to unpowered after a few ticks

4. /summon minecraft:hopper_minecart 200 ~1 200

1. /tp 0 ~ 0
   /tp 199 ~ 200

1. destroy the minecart
2. the detector rail will remain powered