When throwing a various redstone items or blocks in a Hopper, the first item will duplicate in the Hopper-Inventory or in the Chest beneath.
Linked issues
duplicates
Comments
I tried to build an item sorter but it did not work because of this glitch. I will have to modify the design.
92nd duplicate of MC-5998, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.