I went into a Debug World to test out a Resource Pack I'm making, knowing it had every block state in it. I also knew I could go into Creative Mode, break some of the blocks, and listen to the sounds so I could make my Resource Pack's sounds better. I broke many blocks, and knowing they regenerate right after; didn't worry. Then I broke a pressure plate, and I experienced major lag. After waiting a minute, I saw thousands of pressure plate items dropped out of the pressure plate. I had to delete that world and make a new Debug World...