If a chest has a solid block on top, a comparator will read it incorrectly. Try the following:
Place an empty chest with a solid block on top and place the comparator. Then start pushing items into the chest with either a hopper or a dropper. The comparator will not light up even though the items are in the chest. Is this expected behavior?
Thank you for your report!
We're actually already tracking this issue in MC-120986, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki