I was testing the new /worldborder command implemented in the lastest snapshot when I was wondering if it would be possible to get past the worldborder. So I used /worldborder center ~10 ~ ~ to bring it close to me and used /tp Jefferygames ~-15 ~ ~ to get past it. When I got past it I was stuck in a 1x2 area to move around. I was still able to destroy and place blocks in the environment and could tp back in the world boundaries. I then went outside the border and did a command like /worldborder set 100 or something similar to that and was in the same area, but the border moved. I couldn't move and I used /kill to respawn. When brought to the death screen I couldn't select respawn, only title screen. Not sure what I did exactly, but definitely needs to be fixed.