Full hopper on top of a dispenser prevents dispenser from being activated

[dawnraider]

Having a full hopper on top of a dispenser stops the dispenser from being activated. The redstone signal which the hopper send out when full turns on the dispenser, and because it is currently on due to the hopper, the dispenser will respond to no other signals given, preventing the dispenser from ever emptying its contents, and thus the hopper's above it. This breaks the system until the player comes and empties a slot in the hopper manually.

This didn't seem like a bug but more of unintended behavior so I posted it in this forum. This ended up killing my wolves because the hopper feeding them got full so they stopped being fed despite a massive excess of food.

[dawnraider]

Fixed for next release. Adding the comparator to survival allows replacing the current hopper detection method which was causing dispensers to lock.