In some instances the tripwire is not updating.

To replicate:
set up one tripwire with 2 hooks.
break the tripwire with water flowing down onto it.

Another instance I've found is
Place a villager on a fence-gate with a trip wire going through it's middle.
Open the fence gate so the villager falls through.
sometimes the tripwire won't update and will keep the hooks powering.

Gif type thing attached.

https://thumbs.gfycat.com/ThickTartGrayreefshark-size_restricted.gif