Minecraft wiki entry for Redstone_mechanics, associated text: When a change occurs somewhere in a redstone circuit, it can produce other changes in surrounding blocks in what is called a block update. Each of these changes can then produce other changes in their surrounding blocks. The update will propagate following the redstone circuit rules within loaded chunks (block updates will not propagate into unloaded chunks), usually very quickly. Note: in Bedrock Edition, block updates and redstone are not connected.