As the title says, when I leave a boat, it lags behind me and takes about 30 seconds for it to go back into its right place. Usually, when you leave a boat, it's sitting right underneath where you are. Ever since i encountered this bug, the boat is about 50 blocks behind where its supposed to be, then somehow drives itself into its spot.
This only happened to me while driving the boat in a large ocean for over 1000 blocks.