Latency and duplication

Before this release, I duplicated a Shulker box and have no idea how it happened. It happened again after the release of 1.17.40. I have noticed a severe increase in single-player latency when placing blocks. You will see the animation of the block is placed and then you fall. I have noticed items disappearing, like tridents. This has been happening since 1.17 release and now it is happening without leaving the sector or logging out.