I was trying to create some redstone stuff and i knew hoppers would collect items when it was powered, but not send them. But they only take items sended by hoppers. If you try to throw a item at the hopper the item will just start jumping and not going in the hopper. Same with sending from chest and minecart with hopper. If it is supposed to not go in when powered, then fix so hoppers wont send in powered hoppers.
Duplicate of MC-7178, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.