I tried to play with the command block but it lost it function.But the commands still work in chat.

It worked on build 1 and 2,but the command blocks stopped working in build 3 and the current build (build 4).

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The command blocks does not work sometimes.
But sometimes they do work.

I just found out it didnt work because i was multiplayer.The command block is not working in multiplayer.Last time and today i played multiplayer when it did not work.But in single player it works fine.