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When you go to break a block, you have to break it multiple times for it to register broken.
Are you on MP or SP?
If you are on MP note the following statement from @Dyiing "FastBreak has never been able to instantly break blocks, unless you are on Singleplayer. On Multiplayer it's simply too fast for the client-to-server connection."
"FastBreak has never been able to instantly break blocks, unless you are on Singleplayer. On Multiplayer it's simply too fast for the client-to-server connection."
