It is possible to get a long bolt body that locks up at the bolt handle notch before it does on the lugs, pushing the lugs away from the lug abutments.
Typically the tolerance on bolt heads are the most consistant of all the parts in a bolt assembly. I can't say that for the rest, the bolt body,rear baffle and bolt handle will determine whether it will function properly as for primary extraction.
As for the o.p., the bolt body does not take any pressure or stress like the bolt head. Your bolt body was likely defective from the beginning and after a few cycles it finally cracked.