Hoppers will show their breaking animation on the top part despite nothing being there in the texture.
Steps to Reproduce:
1. Make a new Creative world.
2. Give yourself a stack of Hoppers and a Wooden Pickaxe.
3. Switch your gamemode to Survival, place a Hopper, and begin to break it.
4. Notice the breaking texture appears on top, though it should not.
This is related to MC-10206.
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Confirmed.
This is also the case with cauldrons, but I think this is because the breaking animation lies on the outside of the hitbox. It'd be hard to make one hitbox for all parts of the hopper.
chumbanotz