After downloading the new snapshot, I made a new world (As I always do) and found two villages. I used the purple repeating command blocks to make an "impossible space" passage (Teleporting me ~126 blocks when I get near, thats all to it), but I noticed the screen flashing blue when I get teleported, meaning that I can once again tell when I have been teleported. I know that this is a bug, and I checked, searching "teleport" & setting it to 16w02a only. Nothing about this there. If this is in fact just my computer, tell me please.