Going threw nether portals sometimes causes the player falling threw on the other end of the portal sometimes leading to death. I think that the issue here is the world won't load or the game is not spawning u in the correct spot in the portal and causing the player to clip threw. This has been a bug since last update and it's getting my friends killd and frustrated I figured this would have been fixed this update.
On another note 10 mb videos is not enough to send some of there's bugs I'm reporting