When a flatworld is created with the last snapshot, server side and client side aren't synchronized. Causing almost a delay of one second.
How to reproduce:
-Create a flat world
*Take an item and move the quickly in different slot
*Create a fastclock with 2 commandblock
Related issues
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Duplicate of MC-58120
(=> Worlds created between 14w25b and the last 1.8 snapshot are corrupted)
Can confirm. I have created a video which demonstrates this:
http://youtu.be/HagDuZicr_A