When I was sitting on a moving minecart, I opened a trap box on the ground. The trap box can normally activate the nearby red stone mechanism, which is no problem; When I sit on the minecar farther and farther away from the trap box, the trap box automatically closes, which is no problem; But when I went back and opened the trap box again, the lid of the trap box didn't open, and the red stone mechanism nearby didn't show any signs of operation, but I could still clearly see what was in the trap box. For a railway enthusiast, this is a major problem in manufacturing semi-automatic platforms. Thanks for paying attention!