(EDITED) Anything hopper related crashes the game. Throwing items into it crashes. Putting items in it via hopper inventory GUI crashes (not 100%, but more often than not). Attempting to push/pull it via pistons crashes. In a few cases, the item a hopper recieves will completely disappear.
Linked issues
Comments 2
Duplicate of MCPE-18157 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
Please keep me updated on this. I have maps using them that are now effectively broken.