When digging blocks that are directly above you until reaching the nearest untouchable block, continuously jump and hold down the left mouse button to try digging, and you can break blocks intermittently. Even if you stop midway, the digging progress and animation are still retained. This works with any tool, including bare hands.
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上课睡大觉zzz
In case it helps track down the true origin of this behavior, I reproduced it down to 14w29a, the update where block cracking animations first displayed on blocks like beds, chests, and signs.
Regardless of whether it was intentional I do think the behavior has a real-world realism and logic to it, as it lets you can stand under something and hack away at it with the very tip of your tool/hand from below, but at a reduced speed.
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We're tracking this issue in MC-69865, so this ticket is being resolved and linked as a Duplicate.
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