In certain circumstances, redstone dust will remain powered despise there being no power source.
This may be caused by chunk borders
How to reproduce:
- Download the atteached world. There will be a complicated redstone contraption, but only a couple of block matter. On the bottom right, there is a redstone dust on lime concrete with a sign on it.
- Flip the lever in front of the diamond blocks once.
- Wait for the redstone to calm down
- Flip the lever again, pay attention to the aforementioned redstone dust
- Notice how the redstone dust stays powered despite there being no power source
- Place a block next to the redstone dust
- This will give the redstone dust an update, causing it to depower, but only when updated by a player