Noting that the OP said the pendant was in the chock, and noting the wear on the chock, the above sounds completly correct. I would spend some real effort figuring out how to keep the pendant out of the roller. Or find a nice sheltered marina.Well David, this recovery kind'a puts paid to the idea of the "poor quality" of Beneteau construction, eh? Good for you.
After looking at the damage to your bow roller--
--and your chafed snubber/pendent, I suspect that the failure was caused by the plunging of the bow in the seas. With the bow down and driven the starboard, and yet a taught starboard pendent, I could see the snubber/pendent easily being "hooked" by the starboard side plate of the bow roller as the bow rose. With that, the pendent would have loaded up the side plate with each subsequent plunge and roll of the yacht, overloading the plate across the plane of the plate and eventually breaking it off while certainly deeply chafing the pendent at a point where it was unprotected. When that finally snapped leaving only a single snubber/pendent on the port side, the boat's fate was likely sealed. I don't know if a pin, alone, in the forward most pin-holes on the roller fitting would have prevented the foregoing but it might have helped. A bowed "keeper" strap between the outboard side plates, held by the roller pins, would prevent the possibility entirely.
The wear pattern on the chock also confirms that the pendant is way too short. Would a longer pendant had a lesser or greater tendancy to jump? Less, I think, as the boat would not be hauled down so sharply through waves. The pendant length may have been the most important factor.