Remains in 14w28a.
Is there a way to report a new affected version, other than in the comments?
Still in 14w27b.
This bug has extreme impact on map making and map playing experience.
Can be effectively reproduced with these steps:
1. Launch the map on a server (not a local one, Realms should be good).
2. Login to the server. If possible, login with at least 2 more players.
3. Make a hopper clock-generator with two output comparators.
4. Place two command blocks, one on each output. First CB: /tp @a ~ ~50 ~. Second CB: /tp @a ~ ~-50 ~
5. Try to fly around in creative mode. The bug will be noticeable.
More info: when this happens, player also doesn't receive any scoreboard or status updates. I have a clock that increments player XP constantly, and it stops for a moment until player will be snapped back.