Well when playing for a some time and then later on get in a boat and travel long distances, the game crashes while in the boat. Then when you load Minecraft back up, then open that same world, the boat disappears leaving you without a boat and in the water. Entities that were in the boat before the game crashes, they disappear along with the boat. Mules with a saddle that have items in the saddle, they also disappear with the mule. Also Minecraft freezes up and then crashes the game as well. Also when sprint swimming while bobbing up and down in the water, the screen flashes a ton of times. It flashes when going in and out of the water when sprint swimming. The flickers are at an extremely rapid rate. This wasn't in the previous beta update as it worked smoothly just fine in the update before this.