Definitely doesn't look normal. With a May build date, tire age should not be an issue. That wouldn't be normal even if the tires were 4 years old. It does look most like some sort of damage. Maybe cold temperatures making the compound a bit more 'brittle'? But I'm guessing now, I don't even know if it is cold where you are. Strange for sure.
I have accepted a new position at Tire Rack and am no longer in the sales department. firstname.lastname@example.org
is available to assist with M3 questions.