When I put water already then I placed hopper on water so water would be finished by due to very rare glitch no affect on water even hopper was placed...... see it in my picture please show this glitch please
MCPE-121522
Hopper inside water
Resolved
Works As Intended
0
This is working as intended. Hoppers are non-full blocks, which allows them to be waterlogged.
https://minecraft.gamepedia.com/Waterlogging