[MC-3107] Sometimes cant hit Mobs

Sometimes it is impossible to hit mobs when you are in range. It just doesnt deal damage to them, but it deals damage to the tool.

Environment

Windows 7 Home Premium 64 Bit, AMD Athlon/tm) II X2 215 Processor 2.70 GHz, 4GB ram, Java 1.7.0_06

Duplicate of MC-2713

Confirmed and please fix this is really annoying!

Thank you for finding the duplicate, Tails.

And please, in the future, do use the search function to check if the bug wasn't posted before, Marius.