When I built a water blade, I put a lever in front of the dispenser and it didn't stop water flow. (I also checked the wiki.)

Steps to reproduce

1. Place a lever in front of the dispenser
2. Put a water bucket in the dispenser
3. Power the dispenser with the lever

What I observed

The lever does not block water flow and it does not break

What I expected

The lever should block water flow and break