Dispenser bug regarding liquids

THE BUG

-When a dispenser facing a source of water has a full bucket of water in it, it will not empty that bucket but rather spit out that bucket of water out.

HOW TO REPRODUCE

-he best way to recreate this bug is to make a dispenser face a water source and have one water bucket inside and a button to activate the dispenser.

ADDITIONAL THINGS TO NOTE

-there is a video showing this bug.

-The same thing happens with lava and dispensers.