When rapidly left and right clicking in tandem (to replace one type of block with another) if the clicks are too close together, the second is ignored and the first is "sticky", performing that action (e.g. breaking blocks) without any input from the player.
You have to press the afflicted button again to get the game to recognize that the button was, in fact, released.
Linked issues
duplicates
Comments
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migrated
Hmm, it definitely happened, and it was fairly easy, but now I can't get it to either.
tryashtar
Touchscreen mode strikes again? 😛
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Possible
Cannot reproduce, even with a macro on my mouse.