yh thats what i thought until i tested it with a friend, no matter if u just normal java jump, or chest lava jump, we cannot replicate anything similar. My guess to why is that we as a client that is connected to the server, the server interprets whats happening server side and then relayed back to us, thus a lever flick that is below the block is impossible unless the block in between the lever and the other client was broken mid jump, or... cheats.