If you click on the air or a block out of range, then, without releasing the mouse button, try to break a block, it will not break on the first swing. This may or may not be related to MC-28444.
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Comments 5

Is this still a concern in the latest Minecraft version 14w30c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
I just tested it, and both this and the related issue are still concerns. I will update the versions.

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
No response for over a year.
Confirmed.