No they don't, they all have the bios bug if you didn't upgrade the bios already, but having the bug with a mobo that is giving a max of 1.1volt will bring it up to what ?! let's be crazy and say 1.2V ,the CPU will still be fine and never degrade.
If you have a mobo that pushes 1.5V from the getgo then you will probably suffer degradation, but 1.5V only happens with the very high end k CPUs in overclocker mobos.
Ok, maybe I didn't understand your initial post.
Please explain to me what you personally mean when you say "design issue" .