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With the new patch, manual hacking now proceeds as soon as the right key is pressed (which is great) but there's no downside to pressing a *wrong* key. Thus, simply mashing the entire keypad will quickly hack any door. An incorrect entry should probably end the hacking attempt in failure, especially since the log indicates when an incorrect key is pressed. It just doesn't care.
Thanks Patroklos - I'll look into this. Appreciate you letting me know.