I was running on the parkour in the Free Build lobby when I discovered this bug. If you are running and jumping or maybe just walking and jumping (jumping seems to be the issue) over the void you seem to get teleported back on the block you attempted the jump even if you completed the jump. This bug is way worse if you try to play Super Craft Bros and double jump over the void. Proof? Well you can ask about it to players or maybe experience it yourself. All my friends in the friends list have the same problem.