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It has been my experience that there are 2 things that lead to this problem. The first is when someone gives the crank a serious whack with a BFH and misses. The second is when the flywheel bolts are mixed up with the transmission rear bearing retainer bolts and tightened against the flange. This breaks the flange because while the bolts look considerably like the flywheel bolts, they are 1/4" too long and run up against the cap flange. It can happen if the dowel pin retainer is left out but mot every time and there can be other causes but these are the most common.