Comparators can read inventories through chains

Comparators treat chains (any orientation) as a solid block, and thus can read inventories through them.

How to reproduce:
1. Place a chest or other inventory down. Put an item into it.
2. Place a chain next to the inventory
3. Place a comparator on the other side of that chain.

You'll see the comparator light up and emit a signal, when it should not.
See picture attached