Activated trip wires stay inactivated when world reloads

I designed a trading hall utilising trip wires which the villagers would activate when they are in allowing other villagers to go into another chamber when one villager is already in a chamber. When i reloaded the world, the villagers that were already in the chambers activating the trip wires was no longer sending a signal out. (Image below). This is extremely annoying as the design should be functionally fine but doesn't work due to what I can assume is a bug. You can simply reproduce this by putting a minecart with a villager in, putting the minecart and villager in line with a tripwire so that it gets activated. Leave the world and rejoin.

Please fix this. 

Image info:

The first image is what it is meant to look like with the villager triggering the tripwire and activating the redstone. The second image is the bug where the villager is still there triggering the tripwire but the redstone is not activated