I was building my adventure map and just had a sword equipped and hitting blocks causes them not to break, Also minimizing the client causes it to crash.
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140+ Duplicate of MC-18368, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being resolved as duplicate.
This isn't a bug, but a feature. It's implemented because if you wanna kill a mob you will accidentally break all the blocks.