Hoppers become stuck on world reload at chunk borders

Put the summary of the bug you're having here

What I expected to happen was the comparator would continue working when I reloaded or download a map and opened it

What actually happened was the comparator was stuck on it's previous state when I open a map I downloaded and also reloaded a map on my server
Describe what happened here

Steps to Reproduce:
1. Put two hoppers facing each other
2. Put a comparator on one of the hoppers
3.Put a item in one of the hoppers
4. Restart you world of server with the map and check the comparator