I joined in my brother's server and he told me to build a village. As I started to build a village by mining the trees to make room, the blocks disappeared for one second after instead of immediately. I then spawned 30 pigs and tried to kill them all. It took them a few seconds to kill and the pigs were moved similar to the /tp command. I also tried dropping an item and it took a second to drop it, even picking back up. Placing redstone dust, lighting up portals, and  sprinting are not affected by this bug. My brother's world is now unplayable for me, but it is still playable to the owner of the world. Is there a reason why this bug happened? Thanks!