Hoppers don't work anymore as they should. When putting items into them they act as if they were chests, with or without redstone powering o activation. I placed hoppers in the chest configuration, hopper-to-hopper, and a redstone clock. This was done at a normal superflat world.
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-76562. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.