Redstone locking issue:
When you want to lock a hopper through a block or direct contact with a redstone torch, it won't lock. This breaks sorting systems and will destroy already made automatic sorting systems.

Steps to reproduce:

• Place a chain of hoppers 3 blocks tall.
• Then, place a redstone torch or block next to the hopper.
• If you placed a block, add a repeater facing the block and power it.
• Notice how when you place items into the top hopper, they still go into the bottom hopper.