I was playing on a bedrock dedicated server. I was riding my boat around the ocean and hopped out to explore a ship wreck but when I went back up to the surface my boat disappeared. This issue has happened multiple times and if there was a mob in the boat when I got out it would also disappear. I have found if you go away from the boat until it is out of render distance then travel back to the boat it will reload the boat and it would reappear